Research shows that dogs with chronic kidney disease and low ammonia levels in their urine are three times more likely to die and experience faster disease progression than dogs with normal ammonia levels, according to a 2026 study of 50 dogs published in the Journal of Veterinary Internal Medicine. Gram Research analysis indicates this simple urine test could help veterinarians identify high-risk dogs earlier and start protective treatments sooner.
According to Gram Research analysis, scientists discovered that a simple urine test measuring ammonia levels might help predict which dogs with chronic kidney disease will get sicker faster or live shorter lives. In a study of 50 dogs with kidney problems, those with lower ammonia levels in their urine were three times more likely to die and showed faster disease progression than dogs with normal ammonia levels. This finding could help veterinarians identify which dogs need special treatment earlier, potentially improving their chances of living longer and healthier lives.
Key Statistics
A 2026 prospective study of 50 dogs with chronic kidney disease found that dogs with urine ammonia-to-creatinine ratio below 2.0 had 3 times greater risk of death (hazard ratio 3.045) compared to dogs with normal ammonia levels.
Dogs with low ammonia levels in their urine survived a median of 189 days compared to 445 days for dogs with normal ammonia—a difference of more than 8 months—according to the 2026 veterinary study.
In a 2026 study of 50 dogs with kidney disease, those with low ammonia showed disease progression in 132 days on average, compared to 445 days for dogs with normal ammonia levels—more than 3 times faster decline.
A 2026 analysis of 50 dogs with chronic kidney disease found that dogs with lower protein in their urine had 65% lower risk of death (hazard ratio 0.351), suggesting multiple urine markers help predict outcomes.
The Quick Take
- What they studied: Whether a simple urine test measuring ammonia levels could predict how quickly kidney disease gets worse in dogs and how long they might live
- Who participated: 50 pet dogs with chronic kidney disease at different stages, all eating special kidney-friendly diets prescribed by their veterinarians
- Key finding: Dogs with low ammonia in their urine were three times more likely to die and got sicker twice as fast as dogs with normal ammonia levels
- What it means for you: If your dog has kidney disease, this test might help your vet catch problems earlier and start treatments that could help your dog live longer. However, this is early research, and more studies are needed before this becomes standard practice.
The Research Details
Researchers followed 50 dogs with chronic kidney disease for up to 12 months, measuring a simple urine test called the ammonia-to-creatinine ratio (UACR). This ratio compares the amount of ammonia in a dog’s urine to another substance called creatinine, which helps doctors understand how well the kidneys are working. The dogs were divided into two groups based on whether their ammonia levels were low (below 2.0) or normal (2.0 or higher). The researchers then tracked which dogs got sicker faster and which ones lived longer, looking for connections between ammonia levels and survival.
This type of study is called a prospective observational study, which means researchers watched dogs over time without changing their treatment—they just measured what naturally happened. Most of the dogs in the study (82%) had mild to moderate kidney disease, making them good examples of dogs that veterinarians see regularly in their clinics.
This research approach matters because it looks at a simple, inexpensive test that veterinarians could use in regular practice. Unlike complicated lab tests, a urine ammonia measurement could help identify which dogs are at highest risk of dying or getting sicker, allowing vets to start helpful treatments earlier. The study design also reflects real-world situations—these were pet dogs at actual veterinary clinics, not laboratory animals, so the results are more likely to apply to your own dog.
This study has some strengths: it followed dogs over time, used clear definitions for disease progression, and found strong statistical connections. However, the sample size of 50 dogs is relatively small, which means the results need to be confirmed in larger studies. The study was also published in a peer-reviewed veterinary journal, meaning other experts reviewed it before publication. One limitation is that most dogs had mild disease, so results might be different for dogs with more severe kidney problems.
What the Results Show
The main finding was striking: dogs with low ammonia levels in their urine (below 2.0) had a significantly higher risk of death compared to dogs with normal ammonia levels. Specifically, these dogs were 3 times more likely to die during the study period. When looking at survival time, dogs with low ammonia survived a median of 189 days (about 6 months), while dogs with normal ammonia survived 445 days (about 15 months)—more than twice as long.
The disease also progressed faster in dogs with low ammonia. Dogs with low ammonia levels showed a 25% increase in kidney damage markers in just 132 days on average, while dogs with normal ammonia took 445 days to reach the same level of decline. This means that low ammonia wasn’t just associated with death—it was connected to faster overall disease progression.
Interestingly, the study also found that dogs with lower protein in their urine (a different marker) actually had better survival rates, suggesting that different urine markers tell different stories about kidney disease in dogs. This highlights why measuring multiple factors, including ammonia, might give veterinarians a more complete picture of each dog’s condition.
The study found that protein levels in urine (measured as UPC ratio) provided additional information. Dogs with lower protein in their urine had about 65% lower risk of death compared to those with higher protein levels. This suggests that while low ammonia is a bad sign, low protein might actually be protective. The researchers also noted that most dogs in the study had mild kidney disease (IRIS stage II), which means these findings might be most relevant for dogs in early stages of kidney problems.
This research builds on knowledge from human medicine, where doctors have known for years that poor ammonia excretion (the body’s inability to get rid of ammonia through urine) is connected to worse outcomes in people with kidney disease. However, this is one of the first studies to carefully examine whether the same pattern holds true in dogs. The findings suggest that ammonia excretion might be just as important in dogs as it is in people, opening the door to using similar monitoring strategies in veterinary medicine.
The study followed dogs for only up to 12 months, so we don’t know if these patterns continue over longer periods. The sample size of 50 dogs is relatively small—larger studies would give more confidence in the results. Most dogs in the study had mild kidney disease, so the findings might not apply to dogs with more severe disease. The study also didn’t test whether treating dogs with low ammonia (for example, with medications that help the body excrete ammonia) would actually improve their survival, so we can’t yet say that fixing low ammonia will help dogs live longer.
The Bottom Line
If your dog has chronic kidney disease, ask your veterinarian about measuring the ammonia-to-creatinine ratio in your dog’s urine as part of regular monitoring. This is a simple, non-invasive test that might help identify dogs at higher risk of faster disease progression. If your dog has low ammonia levels, discuss with your vet whether treatments like alkaline therapy (medications that reduce acid in the body) might help. However, this is still emerging research, so treatment decisions should be made with your veterinarian based on your individual dog’s situation.
This research is most relevant for dog owners whose pets have been diagnosed with chronic kidney disease, especially those in early to moderate stages. Veterinarians who treat dogs with kidney disease should consider this test as part of their monitoring toolkit. Dogs with other conditions affecting kidney function might also benefit from this test, though more research is needed. This research is less relevant for dogs without kidney disease or those with acute (sudden) kidney problems rather than chronic (long-term) disease.
Changes from treatment based on ammonia levels would likely take weeks to months to show up in survival or disease progression. If your vet recommends treatment based on low ammonia levels, you should expect to see improvements in kidney function markers (like creatinine levels) within 4-8 weeks. However, since this is new research, your vet may want to monitor your dog more frequently initially to see how they respond.
Frequently Asked Questions
What is ammonia-to-creatinine ratio and why does it matter for dogs with kidney disease?
The ammonia-to-creatinine ratio (UACR) is a simple urine test measuring how much ammonia your dog’s kidneys can excrete. A 2026 study found that dogs with low UACR were 3 times more likely to die and showed faster disease progression, making it a potentially useful marker for identifying at-risk dogs.
How often should my dog with kidney disease get tested for ammonia levels?
Current guidelines don’t yet specify testing frequency for ammonia levels, as this is emerging research. Discuss with your veterinarian about adding this test to your dog’s regular kidney monitoring schedule, typically every 3-6 months depending on disease stage and other health factors.
If my dog has low ammonia levels, what treatment options are available?
The 2026 study suggests alkali therapy (medications that reduce body acid) might help dogs with low ammonia, but more research is needed. Your veterinarian can discuss whether this or other treatments are appropriate for your dog’s specific situation and disease stage.
Can this ammonia test predict how long my dog will live?
The ammonia test appears to be a useful indicator of risk, but it cannot predict individual survival with certainty. A 2026 study showed dogs with low ammonia had shorter median survival (189 vs 445 days), but individual outcomes vary based on many factors including age, overall health, and treatment response.
Is ammonia testing available at my regular veterinary clinic?
Ammonia-to-creatinine ratio testing may not yet be routinely available at all clinics since this is new research. Ask your veterinarian whether they can perform this test or refer you to a specialty lab that offers urine ammonia measurement.
Want to Apply This Research?
- Track your dog’s urine ammonia-to-creatinine ratio (UACR) results at each veterinary visit, noting the date and value. Set reminders for regular kidney function tests every 3-6 months, and log any changes in your dog’s symptoms like increased thirst, decreased appetite, or lethargy alongside test results.
- Work with your veterinarian to establish a regular monitoring schedule for kidney function tests. If your dog has low ammonia levels, discuss and implement any recommended treatments (such as alkaline therapy or dietary changes) consistently. Keep detailed records of your dog’s diet, water intake, and any medications to share with your vet at each visit.
- Create a simple spreadsheet or use your app to track: (1) UACR test results and dates, (2) serum creatinine levels, (3) protein in urine (UPC ratio), (4) your dog’s weight and appetite, and (5) any symptoms. Compare results over time to spot trends. Share this information with your vet every 3-6 months to adjust treatment plans as needed.
This article summarizes research findings and is not a substitute for professional veterinary advice. The ammonia-to-creatinine ratio test is an emerging biomarker and is not yet standard of care for all dogs with kidney disease. Do not make treatment decisions based solely on this information. Always consult with your veterinarian before starting new treatments, changing your dog’s diet, or making other health decisions. Your veterinarian can assess your individual dog’s condition and recommend appropriate monitoring and treatment based on their specific needs and disease stage.
This research translation is published by Gram Research, the science division of Gram, an AI-powered nutrition tracking app.