Kidney disease in dogs may develop gradually or appear suddenly. The first signs can be subtle: your dog may drink more, urinate more or lose weight. Other dogs become ill rapidly after an infection, toxin exposure or another acute problem. Because the causes differ, there is no reliable way to diagnose kidney disease from symptoms alone.
Changes that deserve a veterinary appointment
- Drinking more water or needing to urinate much more often
- Unexplained weight loss, reduced appetite or nausea
- Recurring vomiting, bad breath or changes in energy
- New accidents in a previously house-trained dog
- Abnormal urine, discomfort urinating or a history of certain toxin exposures
These signs are not specific to kidneys. Diabetes, urinary tract disease and other illnesses may be involved, so prompt testing is more useful than guessing.
When to seek emergency treatment
Go to an emergency veterinarian for collapse, severe weakness, repeated vomiting with inability to keep water down, seizures, severe distress or an inability to pass urine. Suspected ingestion of grapes, raisins, antifreeze or certain medications needs immediate veterinary or poison-control advice even before symptoms develop. See also our guide to dangerous foods for dogs.
Acute versus chronic kidney problems
Acute kidney injury can occur over hours or days, sometimes following toxins, reduced blood flow or infection. Chronic kidney disease usually develops over a longer period and may be found during routine testing before major symptoms occur. Both require a diagnosis, but treatment plans and outlook are not the same.
Which tests help?
Veterinarians use history, examination, blood values such as creatinine, urine concentration and sometimes SDMA, blood pressure, urine protein tests, culture or imaging. Results are interpreted together. For stable dogs with confirmed chronic kidney disease, the International Renal Interest Society (IRIS) guidelines help veterinarians stage disease and individualize monitoring and treatment. One lab result by itself does not tell the whole story.
Should you change food or give supplements?
Do not start a restrictive home diet or human kidney supplements on your own. Some dogs benefit from a prescribed kidney diet, but diet choice, calories, hydration and any medication need to reflect the diagnosis and stage. A dog that refuses food or is dehydrated should not wait for a routine diet conversation.
What can you monitor at home?
Record weight, appetite, water intake, urination and medication changes. Ask the vet which follow-up tests are needed and which symptoms warrant a same-day call. Never withhold drinking water in an attempt to reduce urination unless a treating veterinarian has directed a specific plan.
References: IRIS: current kidney disease staging and care guidelines; Merck: urgent veterinary warning signs.
General educational material only. A veterinarian must evaluate kidney disease and recommend treatment.
This article is for general education and is not a substitute for care from your own veterinarian. Learn about The Pet Vet and our editorial policy.