The earliest sign of kidney disease in dogs is usually drinking more water and urinating more.1,2 Because the kidneys have a large reserve, these signs often appear only after roughly two-thirds or more of kidney function has been lost.1,2 As kidney failure progresses, waste builds up in the blood and dogs may lose their appetite, vomit, lose weight, become lethargic and develop bad breath or mouth ulcers.2,3,4 Sudden kidney failure, often from a poison or infection, can cause these signs within hours to days and is an emergency.5,6,7 This guide covers early, later and end-stage signs, emergencies, conditions that look similar, and how to judge your dog's quality of life.
Go to a vet or emergency clinic now if your dog:
- May have eaten antifreeze, grapes, raisins or a human pain reliever, even if your dog seems fine. Antifreeze can cause an apparent recovery about 12 hours after it is swallowed, before kidney failure sets in 36 to 72 hours after.6,7,8
- Is producing little or no urine, or straining without passing any5,9
- Is vomiting repeatedly, refuses food, is very weak, collapses or has seizures5
- Suddenly seems blind4
See your vet soon if your dog is drinking and urinating more than usual or losing weight.1,2
What the Research Shows
- The most common signs. In 228 dogs diagnosed with CKD at UK practices, vets recorded vomiting in 50%, increased thirst and urination in 44%, poor appetite in 40%, diarrhea or dark stools in 37%, weight loss in 29% and lethargy in 22%.10
- Bad breath was recorded less often. It was noted in 12% of those dogs.10
- Accidents can be a sign. Urinary incontinence was recorded in about 1 in 5 of the dogs.10
- Sudden kidney injury is serious. Roughly half of dogs with severe acute kidney injury survive.3
Early Signs
- Drinking more water. A dog drinking more than about 100 mL per kg of body weight a day (roughly 1.5 fluid ounces per pound) is drinking too much; normal intake is about 40 to 60 mL per kg.11,1
- Urinating more, needing to go out more often, or having accidents indoors1,10
- As it progresses: a pickier appetite and gradual weight loss4,3
Many dogs show no signs at all in the early stages. Early kidney disease can sometimes be picked up on blood and urine tests before any signs appear.3,12
Later Signs
Signs of Sudden (Acute) Kidney Failure
Acute kidney injury comes on quickly. Signs include sudden loss of appetite, listlessness, vomiting or diarrhea (possibly bloody), bad breath, mouth ulcers and, in some dogs, producing little or no urine. By the time they reach a clinic, many are already in shock.5
- Antifreeze: wobbliness, as if drunk, within 30 minutes to 12 hours, then an apparent recovery, then kidney failure at 36 to 72 hours.6
- Grapes or raisins: vomiting or diarrhea within 6 to 12 hours, then kidney failure within 1 to 3 days.7
- Leptospirosis: fever, muscle or back pain, yellow gums or eyes, and little or no urine.9
- Pain relievers (NSAIDs): vomiting, diarrhea, black or bloody stools, poor appetite or reduced activity.8
End-Stage Kidney Failure
In the final stage, dogs often stop eating, vomit, lose weight and muscle, become dehydrated and very weak, and may develop mouth sores and diarrhea.3,2 In one small study, median survival at Stage 4 was about 2 months.13 At this stage your vet may talk with you about fluids, a feeding tube, medicines for nausea and appetite, or palliative care.15,16
Is my dog in pain?
Kidney failure makes dogs feel ill. Nausea, mouth ulcers and weakness are uncomfortable, and acute causes such as antifreeze poisoning and leptospirosis can make the kidneys or back painful.6,9,4 Tell your vet if your dog seems uncomfortable, because many of these problems can be treated.
Conditions That Can Look Like Kidney Disease
Drinking and urinating more has many causes, so blood and urine tests are needed. Other causes include:11,17
- Diabetes
- Cushing's disease
- Addison's disease, which can be mistaken for kidney failure on blood tests
- Pyometra, a womb infection in unspayed females
- Liver disease, urinary tract infection and some cancers
Quality of Life and Saying Goodbye
When kidney failure is advanced, a quality-of-life checklist can help. Ohio State's guide suggests listing three to five things your dog loves to do, noticing when they can no longer enjoy them, and marking good and bad days on a calendar. Pain or breathing trouble should weigh heavily.18 Many owners decide on euthanasia once bad days outnumber good ones, and the procedure itself does not cause pain.19 Your vet can guide you but can't make the decision for you. As Ohio State's guide puts it, "there is truly no wrong decision to be made, only the decision you feel is best for your pet and your family."18 See kidney disease in dogs for treatment options.
Frequently Asked Questions
What are the first signs of kidney failure in dogs?
Drinking and urinating more than usual, then a poorer appetite, weight loss and vomiting.
What does kidney failure look like in dogs?
A thin, tired dog that drinks a lot, eats little, vomits, and may have bad breath, mouth ulcers and pale gums.
Are dogs in pain with kidney failure?
They feel unwell from nausea, mouth sores and weakness, and some causes of sudden kidney injury can be painful. Your vet can treat much of this.
How fast does kidney disease progress in dogs?
Chronic disease usually progresses over months to years, but sudden kidney injury can develop in hours to days.
What can be mistaken for kidney failure in dogs?
Diabetes, Cushing's disease, Addison's disease, pyometra and liver disease can cause similar signs.
When should I put my dog down with kidney failure?
There's no single right time. Many owners consider it when bad days outnumber good ones and their dog can no longer enjoy favorite things. A quality-of-life scale and your vet can help.
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Sources and further reading
This article was written and fact-checked on October 18, 2026 against current veterinary references and specialist guidelines:
- International Renal Interest Society. What pet owners should know. IRIS, accessed October 2026.
- Barnes C, Llera R, Weir M, Ward E. Chronic Kidney Disease in Dogs. VCA Animal Hospitals, updated May 2026.
- Brown SA. Noninfectious Diseases of the Urinary System in Dogs. Merck Veterinary Manual (pet owner version), reviewed June 2018, updated May 2026.
- BluePearl Specialists. Kidneys: Chronic Kidney Disease and Long-Term Renal Failure. BluePearl, June 2016.
- Weir M. Acute Kidney Injury in Dogs. VCA Animal Hospitals, updated April 2026.
- Regehr T. Ethylene Glycol Toxicosis in Animals. Merck Veterinary Manual (professional version), reviewed January 2022, updated September 2024.
- Hayes C. Grape, Raisin, and Tamarind Toxicosis in Dogs. Merck Veterinary Manual (professional version), reviewed September 2024.
- US Food and Drug Administration, Center for Veterinary Medicine. Get the Facts about Pain Relievers for Pets. FDA, September 2022.
- Roman N. Leptospirosis in Dogs. Merck Veterinary Manual (pet owner version), reviewed June 2026.
- O'Neill DG, Elliott J, Church DB, McGreevy PD, Thomson PC, Brodbelt DC. Chronic kidney disease in dogs in UK veterinary practices: prevalence, risk factors, and survival. J Vet Intern Med. 2013;27(4):814-821.
- Collins B. Canine Polyuria and Polydipsia (PU/PD). Riney Canine Health Center, Cornell University College of Veterinary Medicine, April 2024.
- International Renal Interest Society. IRIS Staging System. IRIS, accessed October 2026.
- Rudinsky AJ, Harjes LM, Byron J, Chew DJ, Toribio RE, Langston C, Parker VJ. Factors associated with survival in dogs with chronic kidney disease. J Vet Intern Med. 2018;32(6):1977-1982.
- Pedrinelli V, Lima DM, Duarte CN, et al. Nutritional and laboratory parameters affect the survival of dogs with chronic kidney disease. PLoS One. 2020;15(6):e0234712.
- International Renal Interest Society. IRIS Pocket Guide to CKD. IRIS, June 2026.
- American Animal Hospital Association, International Association for Animal Hospice and Palliative Care. 2016 AAHA/IAAHPC End-of-Life Care Guidelines. AAHA, 2016.
- Long C, Gorman L. Hypoadrenocorticism in Dogs. MSPCA-Angell, May 2026.
- Honoring the Bond Program. How Will I Know? Assessing Quality of Life and Making Difficult Decisions for Your Pet. The Ohio State University Veterinary Medical Center, undated.
- Bryan L. Euthanasia: Why, When, and How to Say Goodbye to a Pet. University of Illinois College of Veterinary Medicine, February 2024.
About this article
Last updated : new page, written using IRIS, Merck Veterinary Manual, VCA, Cornell and Ohio State guidance and published research on kidney disease in dogs.
This page is for general information and is not a substitute for an exam by your veterinarian.
