Dog Blood Work on a Natural Diet: What Really Changes
If your dog eats fresh, air-dried, or minimally processed food, some blood markers will look different from the printed "normal" range. This isn't cause for alarm. It's something worth understanding, so you and your vet can interpret results together.
This article doesn't argue that blood tests are unreliable, or that vets are interpreting things incorrectly. It does something more useful: it explains what genuinely changes in blood chemistry when a dog eats high-quality natural food, so that you can walk into your vet's clinic with better context - and have a more informed conversation.
The goal is a pet parent and vet on the same page. Not one correcting the other.
Why Your Dog's "Normal" May Not Be on That Lab Sheet
When a blood test comes back and certain values are flagged, the comparison point is always a reference range - the band of values that represents "typical healthy dogs." This range was established over decades of veterinary research.
Most of that research was conducted on dogs eating commercial dry kibble, because that's what the vast majority of dogs eat. That's not a flaw in the research. It's just what the data reflects.
Dry kibble is typically around 10% moisture, 30–60% carbohydrates, and uses mixed animal and plant protein sources processed at very high temperatures. A dog whose entire life has been spent eating that diet has a particular metabolic baseline - and that baseline became the reference standard.
Your dog on a fresh, air-dried, or raw diet is eating something genuinely different: higher animal protein, more moisture from food itself, fewer processed carbohydrates, and lower inflammatory load from additives and heat-damaged fats. Their body reflects that difference - including in blood chemistry.
Veterinary researchers Dr. Jean Dodds and Dr. Susan Wynn studied over 200 dogs across kibble-fed and naturally-fed groups and reached a clear conclusion: reference ranges for naturally-fed dogs need to be considered separately from those built on processed diets. [1] This isn't fringe opinion - it's a documented research finding that informs how progressive clinicians approach nutrition-aware blood panel reading.
What Blood Values Change on a Natural or Air-Dried Diet - and Why
Most blood values stay entirely consistent regardless of diet. The differences that show up in naturally-fed dogs are specific and predictable. Here's what to look out for, what drives each shift, and how a vet familiar with natural diets will read it.
BUN is produced when the liver breaks down protein. More high-quality animal protein in the diet means more nitrogen metabolism - so BUN runs higher. This was observed in every naturally-fed group in the Dodds-Wynn study. [1]
How to read it: BUN on its own doesn't tell you much. A vet will look at BUN and creatinine together, alongside hydration status and whether the dog has any symptoms. An elevated BUN with a normal creatinine in a healthy, hydrated dog is almost always dietary.
Unlike BUN, creatinine is not meaningfully driven up by what a dog eats. It's cleared by the kidneys through glomerular filtration at a rate that reflects kidney function, not diet. On a natural diet, creatinine largely stays within normal range. Any very mild upward nudge is typically linked to better muscle mass from quality protein. [2]
Why this matters: This is exactly what makes creatinine the more reliable kidney marker for naturally-fed dogs. BUN rises because of diet. Creatinine doesn't. So if creatinine is significantly elevated alongside BUN, diet is no longer a sufficient explanation. That combination is what warrants investigation, not BUN alone.
Haematocrit measures the proportion of red blood cells in blood. Natural diets provide better bioavailable iron and B-vitamins from animal sources - both critical for red blood cell production. Slightly elevated haematocrit in naturally-fed dogs is a nutritional green flag, not a concern. [1]
ALT is a liver enzyme that rises when hepatocytes are under stress, but also transiently when the liver is processing a higher fat load, as it would with a quality natural diet. Importantly, research suggests that high-carbohydrate diets actually carry a greater risk of elevated liver enzymes than protein-forward natural diets. [4]
How to read it: A mildly elevated ALT alongside normal ALP and normal bilirubin in an active, symptom-free dog is very rarely cause for immediate intervention. The right follow-up is bile acid testing, not alarm.
Platelet counts can run slightly lower in dogs on natural diets, likely reflecting reduced chronic systemic inflammation, a calmer immune baseline. In isolation, this is not concerning.
Important exception: A significant drop in platelets accompanied by fever, lethargy, or tick exposure history should always be investigated for tick-borne disease (Ehrlichiosis, Anaplasmosis). That's a separate matter from diet entirely.
Kibble typically contains 30–60% carbohydrates from grains and legumes, which drives higher baseline glucose. [3] Natural diet dogs show lower, more stable glucose - a direct metabolic advantage linked to better long-term insulin sensitivity.
Higher total protein and better albumin levels are expected on a natural diet, because animal-source amino acids are more bioavailable than the mixed protein in most processed foods. This is a nutritional marker moving in the right direction.
| Marker | Typical on Kibble | On Natural Diet | What It Reflects |
|---|---|---|---|
| BUN | Moderate | Higher | More protein metabolism - dietary, not renal |
| Creatinine | Normal range | Largely stable | Not diet-driven - the reliable kidney signal |
| Haematocrit | Moderate | Higher | Better iron & B-vitamin absorption |
| ALT | Can be elevated | Mildly elevated possible | Read alongside ALP + Bilirubin, not alone |
| Platelets | Moderate | Slightly lower possible | Lower inflammatory baseline |
| Total Protein | Lower | Higher | Better amino acid availability |
| Glucose | Higher | Lower, stable | Fewer carbohydrates - metabolic advantage |
How to Look at a Panel - Clusters, Not Single Numbers
The most important shift in how you read your dog's blood work is moving from single-number thinking to pattern thinking. Real clinical concern almost always shows up across multiple markers simultaneously, and alongside physical symptoms.
For kidney health - look at all four together
BUN + Creatinine + SDMA + Urine Specific Gravity. The key distinction: BUN rises on a high-protein diet. Creatinine largely doesn't - it's cleared by the kidneys through glomerular filtration and isn't meaningfully influenced by what the dog is eating. So on a natural diet, you'd expect BUN to be elevated while creatinine stays relatively stable. That's a dietary pattern. If creatinine is also climbing significantly alongside BUN, that combination can no longer be explained by diet - the kidneys aren't clearing it properly, which is a different matter entirely.
SDMA is a newer, more sensitive marker that detects kidney dysfunction at 40% function loss - versus 75% for BUN alone - and is also unaffected by protein intake. [6] It's worth requesting specifically if kidney health is a concern.
Is SDMA Testing Available in India?
Yes. SDMA is available through reference labs including IDEXX India, Heska-partnered labs, and several diagnostic centres in Bangalore, Mumbai, Chennai, and Hyderabad. If your vet runs blood work through an outside reference lab rather than an in-clinic analyser, ask them specifically whether SDMA is included in the panel - it often isn't in the standard package but can be added on request.
The test matters most for dogs on high-protein natural diets where BUN is already elevated and you want to definitively rule out early kidney dysfunction. A normal SDMA alongside an elevated BUN is the clearest possible signal that the BUN elevation is dietary, not renal - and gives both you and your vet real confidence to read the panel correctly.
If you're in a tier-2 city and SDMA isn't locally available, ask your vet to send the sample to an IDEXX-partnered lab in the nearest metro. Turnaround is typically 24–48 hours.
For liver health - look at the full enzyme panel
ALT + ALP + Bilirubin together. A mildly elevated ALT with normal ALP and bilirubin in an active dog is not the same picture as ALT and ALP both rising significantly alongside lethargy or jaundice. If there's any genuine concern, bile acid testing (pre- and post-prandial) is the appropriate next step. [7]
And always factor in the dog in front of you
Energy. Appetite. Coat quality. Stool consistency. Muscle condition. These are the upstream signals. Blood values and physical presentation together tell a complete story. A number in isolation rarely does.
Pattern that usually reflects diet, not disease:
- BUN elevated, creatinine normal or slightly elevated, SDMA normal
- Haematocrit and total protein on the higher end
- Dog is active, eating well, good coat, normal stool
- No fever, no weight loss, no vomiting or lethargy
Pattern that warrants prompt veterinary attention:
- BUN elevated and creatinine also significantly elevated - creatinine rising meaningfully alongside BUN is not a diet effect, it's a kidney signal
- SDMA elevated - confirms reduced kidney filtration independent of diet
- ALT + ALP both significantly elevated alongside symptoms
- Platelet count sharply reduced, with fever or recent tick exposure
- Any cluster of abnormal values paired with clinical deterioration
Three Things Worth Doing Before Your Dog's Next Blood Test
- Tell your vet what your dog eats - specifically. Not just "natural food." Say: high animal protein, fresh or air-dried, rehydrated, minimal carbohydrates. That one sentence changes how a clinician reads the panel. A good vet will factor it in immediately.
- Establish a healthy baseline early. Get a full panel when your dog is well, active, and in good condition. That personal reference is far more meaningful than a population average that wasn't built for your dog's specific diet and physiology.
- Ask specifically for SDMA if kidney health comes up. It's available through reference labs in India and gives a much clearer picture of kidney function in protein-forward diets than BUN alone can provide.
Vets and Pet Nutritionists: Two Different Perspectives on the Same Dog
A vet and a pet nutritionist are looking at the same animal from different angles. A vet brings clinical training, diagnostic skill, and the ability to identify and treat disease. A nutritionist brings understanding of how diet shapes the body's baseline over time - what "well-nourished" looks like metabolically, and how that differs from population averages built on other diets.
These perspectives aren't in tension. They're complementary. The best outcomes for dogs happen when both inform the picture.
The vets I've spoken to who are familiar with natural diets are not caught off guard by these blood shifts. Many of them are ahead of this - and they're the ones who ask what the dog eats before reviewing a panel, not after. If yours doesn't yet, this article is a starting point for that conversation.
A useful thing to bring to your vet:
- A note of exactly what your dog eats: brand, format, protein percentage
- How long they've been on this diet
- Your dog's previous blood panels if available, as a personal baseline
- Any specific markers you'd like explained in the context of their diet
UNDERSTOOD Dog-o-Meals contain 75%+ real animal protein. They're air-dried at 50–75°C - preserving enzymes, amino acid structures, and bioavailable nutrients that high-heat extrusion at 200°C+ destroys. A dog on UNDERSTOOD for 6 months or more will likely show some of the dietary-shift markers described in this article - higher BUN, slightly elevated haematocrit, better total protein. That's not a side effect. It's what a well-nourished dog looks like.
🐕 Dog-o-Meals - Trial from ₹235 🐈 Purr-o-Meals - Trial from ₹289Frequently Asked Questions
Sources & References
- Dodds, W.J. & Wynn, S. Raw Diets and Bloodwork Results: Should You Be Concerned? Hemopet, 2025. hemopet.org
- Gow, A.G. et al. Effect of withholding food versus feeding on creatinine, SDMA, cholesterol, triglycerides in 100 healthy dogs. JVIM / PMC, 2023. pmc.ncbi.nlm.nih.gov
- Morgan, J. Differences in Lab Values for Raw Fed vs. Kibble Fed Dogs and Cats. Dr. Judy Morgan's Naturally Healthy Pets, 2025. drjudymorgan.com
- My Pet Nutritionist. Can Diet Cause Raised Liver Enzymes? 2025. mypetnutritionist.com
- Paws & Claws Animal Hospital. Understanding Your Animal's Veterinary Tests. pawsandclawsanimalhospital.com
- Daily Dog Food Recipes. Reconsidering Blood Urea Nitrogen Reference Ranges in Raw Fed Dogs. 2025. dailydogfoodrecipes.com
- Royal Canin Academy. How I Approach the Dog with Altered Hepatic Enzymes. academy.royalcanin.com
- Raw Essentials NZ. Blood Tests & Raw Feeding. rawessentials.co.nz
This article is for educational purposes and does not constitute veterinary medical advice. Always consult a qualified veterinarian for diagnosis and treatment decisions for your pet.
© 2026 UNDERSTOOD Pet Nutrition · Pondicherry, India · petsunderstood.com
Dog Blood Work on a Natural Diet: What Really Changes
If your dog eats fresh, air-dried, or minimally processed food, some blood markers will look different from the printed "normal" range. This isn't cause for alarm. It's something worth understanding, so you and your vet can interpret results together.
This article doesn't argue that blood tests are unreliable, or that vets are interpreting things incorrectly. It does something more useful: it explains what genuinely changes in blood chemistry when a dog eats high-quality natural food, so that you can walk into your vet's clinic with better context - and have a more informed conversation.
The goal is a pet parent and vet on the same page. Not one correcting the other.
Why Your Dog's "Normal" May Not Be on That Lab Sheet
When a blood test comes back and certain values are flagged, the comparison point is always a reference range - the band of values that represents "typical healthy dogs." This range was established over decades of veterinary research.
Most of that research was conducted on dogs eating commercial dry kibble, because that's what the vast majority of dogs eat. That's not a flaw in the research. It's just what the data reflects.
Dry kibble is typically around 10% moisture, 30–60% carbohydrates, and uses mixed animal and plant protein sources processed at very high temperatures. A dog whose entire life has been spent eating that diet has a particular metabolic baseline - and that baseline became the reference standard.
Your dog on a fresh, air-dried, or raw diet is eating something genuinely different: higher animal protein, more moisture from food itself, fewer processed carbohydrates, and lower inflammatory load from additives and heat-damaged fats. Their body reflects that difference - including in blood chemistry.
Veterinary researchers Dr. Jean Dodds and Dr. Susan Wynn studied over 200 dogs across kibble-fed and naturally-fed groups and reached a clear conclusion: reference ranges for naturally-fed dogs need to be considered separately from those built on processed diets. [1] This isn't fringe opinion - it's a documented research finding that informs how progressive clinicians approach nutrition-aware blood panel reading.
What Blood Values Change on a Natural or Air-Dried Diet - and Why
Most blood values stay entirely consistent regardless of diet. The differences that show up in naturally-fed dogs are specific and predictable. Here's what to look out for, what drives each shift, and how a vet familiar with natural diets will read it.
BUN is produced when the liver breaks down protein. More high-quality animal protein in the diet means more nitrogen metabolism - so BUN runs higher. This was observed in every naturally-fed group in the Dodds-Wynn study. [1]
How to read it: BUN on its own doesn't tell you much. A vet will look at BUN and creatinine together, alongside hydration status and whether the dog has any symptoms. An elevated BUN with a normal creatinine in a healthy, hydrated dog is almost always dietary.
Unlike BUN, creatinine is not meaningfully driven up by what a dog eats. It's cleared by the kidneys through glomerular filtration at a rate that reflects kidney function, not diet. On a natural diet, creatinine largely stays within normal range. Any very mild upward nudge is typically linked to better muscle mass from quality protein. [2]
Why this matters: This is exactly what makes creatinine the more reliable kidney marker for naturally-fed dogs. BUN rises because of diet. Creatinine doesn't. So if creatinine is significantly elevated alongside BUN, diet is no longer a sufficient explanation. That combination is what warrants investigation, not BUN alone.
Haematocrit measures the proportion of red blood cells in blood. Natural diets provide better bioavailable iron and B-vitamins from animal sources - both critical for red blood cell production. Slightly elevated haematocrit in naturally-fed dogs is a nutritional green flag, not a concern. [1]
ALT is a liver enzyme that rises when hepatocytes are under stress, but also transiently when the liver is processing a higher fat load, as it would with a quality natural diet. Importantly, research suggests that high-carbohydrate diets actually carry a greater risk of elevated liver enzymes than protein-forward natural diets. [4]
How to read it: A mildly elevated ALT alongside normal ALP and normal bilirubin in an active, symptom-free dog is very rarely cause for immediate intervention. The right follow-up is bile acid testing, not alarm.
Platelet counts can run slightly lower in dogs on natural diets, likely reflecting reduced chronic systemic inflammation, a calmer immune baseline. In isolation, this is not concerning.
Important exception: A significant drop in platelets accompanied by fever, lethargy, or tick exposure history should always be investigated for tick-borne disease (Ehrlichiosis, Anaplasmosis). That's a separate matter from diet entirely.
Kibble typically contains 30–60% carbohydrates from grains and legumes, which drives higher baseline glucose. [3] Natural diet dogs show lower, more stable glucose - a direct metabolic advantage linked to better long-term insulin sensitivity.
Higher total protein and better albumin levels are expected on a natural diet, because animal-source amino acids are more bioavailable than the mixed protein in most processed foods. This is a nutritional marker moving in the right direction.
| Marker | Typical on Kibble | On Natural Diet | What It Reflects |
|---|---|---|---|
| BUN | Moderate | Higher | More protein metabolism - dietary, not renal |
| Creatinine | Normal range | Largely stable | Not diet-driven - the reliable kidney signal |
| Haematocrit | Moderate | Higher | Better iron & B-vitamin absorption |
| ALT | Can be elevated | Mildly elevated possible | Read alongside ALP + Bilirubin, not alone |
| Platelets | Moderate | Slightly lower possible | Lower inflammatory baseline |
| Total Protein | Lower | Higher | Better amino acid availability |
| Glucose | Higher | Lower, stable | Fewer carbohydrates - metabolic advantage |
How to Look at a Panel - Clusters, Not Single Numbers
The most important shift in how you read your dog's blood work is moving from single-number thinking to pattern thinking. Real clinical concern almost always shows up across multiple markers simultaneously, and alongside physical symptoms.
For kidney health - look at all four together
BUN + Creatinine + SDMA + Urine Specific Gravity. The key distinction: BUN rises on a high-protein diet. Creatinine largely doesn't - it's cleared by the kidneys through glomerular filtration and isn't meaningfully influenced by what the dog is eating. So on a natural diet, you'd expect BUN to be elevated while creatinine stays relatively stable. That's a dietary pattern. If creatinine is also climbing significantly alongside BUN, that combination can no longer be explained by diet - the kidneys aren't clearing it properly, which is a different matter entirely.
SDMA is a newer, more sensitive marker that detects kidney dysfunction at 40% function loss - versus 75% for BUN alone - and is also unaffected by protein intake. [6] It's worth requesting specifically if kidney health is a concern.
Is SDMA Testing Available in India?
Yes. SDMA is available through reference labs including IDEXX India, Heska-partnered labs, and several diagnostic centres in Bangalore, Mumbai, Chennai, and Hyderabad. If your vet runs blood work through an outside reference lab rather than an in-clinic analyser, ask them specifically whether SDMA is included in the panel - it often isn't in the standard package but can be added on request.
The test matters most for dogs on high-protein natural diets where BUN is already elevated and you want to definitively rule out early kidney dysfunction. A normal SDMA alongside an elevated BUN is the clearest possible signal that the BUN elevation is dietary, not renal - and gives both you and your vet real confidence to read the panel correctly.
If you're in a tier-2 city and SDMA isn't locally available, ask your vet to send the sample to an IDEXX-partnered lab in the nearest metro. Turnaround is typically 24–48 hours.
For liver health - look at the full enzyme panel
ALT + ALP + Bilirubin together. A mildly elevated ALT with normal ALP and bilirubin in an active dog is not the same picture as ALT and ALP both rising significantly alongside lethargy or jaundice. If there's any genuine concern, bile acid testing (pre- and post-prandial) is the appropriate next step. [7]
And always factor in the dog in front of you
Energy. Appetite. Coat quality. Stool consistency. Muscle condition. These are the upstream signals. Blood values and physical presentation together tell a complete story. A number in isolation rarely does.
Pattern that usually reflects diet, not disease:
- BUN elevated, creatinine normal or slightly elevated, SDMA normal
- Haematocrit and total protein on the higher end
- Dog is active, eating well, good coat, normal stool
- No fever, no weight loss, no vomiting or lethargy
Pattern that warrants prompt veterinary attention:
- BUN elevated and creatinine also significantly elevated - creatinine rising meaningfully alongside BUN is not a diet effect, it's a kidney signal
- SDMA elevated - confirms reduced kidney filtration independent of diet
- ALT + ALP both significantly elevated alongside symptoms
- Platelet count sharply reduced, with fever or recent tick exposure
- Any cluster of abnormal values paired with clinical deterioration
Three Things Worth Doing Before Your Dog's Next Blood Test
- Tell your vet what your dog eats - specifically. Not just "natural food." Say: high animal protein, fresh or air-dried, rehydrated, minimal carbohydrates. That one sentence changes how a clinician reads the panel. A good vet will factor it in immediately.
- Establish a healthy baseline early. Get a full panel when your dog is well, active, and in good condition. That personal reference is far more meaningful than a population average that wasn't built for your dog's specific diet and physiology.
- Ask specifically for SDMA if kidney health comes up. It's available through reference labs in India and gives a much clearer picture of kidney function in protein-forward diets than BUN alone can provide.
Vets and Pet Nutritionists: Two Different Perspectives on the Same Dog
A vet and a pet nutritionist are looking at the same animal from different angles. A vet brings clinical training, diagnostic skill, and the ability to identify and treat disease. A nutritionist brings understanding of how diet shapes the body's baseline over time - what "well-nourished" looks like metabolically, and how that differs from population averages built on other diets.
These perspectives aren't in tension. They're complementary. The best outcomes for dogs happen when both inform the picture.
The vets I've spoken to who are familiar with natural diets are not caught off guard by these blood shifts. Many of them are ahead of this - and they're the ones who ask what the dog eats before reviewing a panel, not after. If yours doesn't yet, this article is a starting point for that conversation.
A useful thing to bring to your vet:
- A note of exactly what your dog eats: brand, format, protein percentage
- How long they've been on this diet
- Your dog's previous blood panels if available, as a personal baseline
- Any specific markers you'd like explained in the context of their diet
UNDERSTOOD Dog-o-Meals contain 75%+ real animal protein. They're air-dried at 50–75°C - preserving enzymes, amino acid structures, and bioavailable nutrients that high-heat extrusion at 200°C+ destroys. A dog on UNDERSTOOD for 6 months or more will likely show some of the dietary-shift markers described in this article - higher BUN, slightly elevated haematocrit, better total protein. That's not a side effect. It's what a well-nourished dog looks like.
🐕 Dog-o-Meals - Trial from ₹235 🐈 Purr-o-Meals - Trial from ₹289Frequently Asked Questions
Sources & References
- Dodds, W.J. & Wynn, S. Raw Diets and Bloodwork Results: Should You Be Concerned? Hemopet, 2025. hemopet.org
- Gow, A.G. et al. Effect of withholding food versus feeding on creatinine, SDMA, cholesterol, triglycerides in 100 healthy dogs. JVIM / PMC, 2023. pmc.ncbi.nlm.nih.gov
- Morgan, J. Differences in Lab Values for Raw Fed vs. Kibble Fed Dogs and Cats. Dr. Judy Morgan's Naturally Healthy Pets, 2025. drjudymorgan.com
- My Pet Nutritionist. Can Diet Cause Raised Liver Enzymes? 2025. mypetnutritionist.com
- Paws & Claws Animal Hospital. Understanding Your Animal's Veterinary Tests. pawsandclawsanimalhospital.com
- Daily Dog Food Recipes. Reconsidering Blood Urea Nitrogen Reference Ranges in Raw Fed Dogs. 2025. dailydogfoodrecipes.com
- Royal Canin Academy. How I Approach the Dog with Altered Hepatic Enzymes. academy.royalcanin.com
- Raw Essentials NZ. Blood Tests & Raw Feeding. rawessentials.co.nz
This article is for educational purposes and does not constitute veterinary medical advice. Always consult a qualified veterinarian for diagnosis and treatment decisions for your pet.
© 2026 UNDERSTOOD Pet Nutrition · Pondicherry, India · petsunderstood.com