Last Updated: 05/08/2026
Kidney Disease in Dogs: Signs, Symptoms and Management
Kidney disease in dogs: signs, symptoms, causes and management explained by our vet team. Plus how a kidney diet can help your dog live well with CKD.
Author: Dr Teagan Lever BVSc (Hons)
Reading Time: 7 minutes - short read
Is your dog drinking more than usual or slowly losing weight? Kidney disease is a common condition in senior dogs, but it can affect younger dogs too - especially certain breeds. Understanding the difference between sudden kidney failure and long-term chronic disease, and catching the signs early, can make a real difference to how well your dog does long-term.
If you have a cat with kidney disease, see our Kidney Disease in Cats guide.
In this article
- What is kidney disease in dogs?
- What causes kidney disease in dogs?
- What are the signs of kidney disease in dogs?
- What are the stages of kidney disease in dogs?
- How is kidney disease in dogs managed?
- What's the best kidney diet for dogs?
- How do I keep my dog with kidney disease hydrated?
- Why is regular veterinary monitoring so important?
What is kidney disease in dogs?
Kidney disease (also called renal disease in dogs) occurs when the kidneys lose their ability to effectively filter waste products from the blood and maintain the body's fluid balance. You might also hear your vet refer to it as CKD (chronic kidney disease) or, in older texts, CRF (chronic renal failure).
In a healthy dog, the kidneys act as a sophisticated waste management system, producing urine to flush out toxins while keeping essential nutrients and water inside the body. When kidney cells become damaged (whether through age, genetics, or sudden illness) these toxins begin to build up in the bloodstream, often making your dog feel quite unwell.
Because the kidneys have a large "reserve capacity," dogs often don't show visible signs of illness until a significant portion of their kidney function (about 75%) has already been lost. This makes early detection through regular vet check-ups a really important part of proactive pet parenting.
What causes kidney disease in dogs?
Kidney disease is classified as either acute (sudden) or chronic (long-term).
Acute kidney failure
Acute kidney failure (sometimes called acute renal failure in dogs) occurs suddenly, often in response to toxins, drugs, shock, infection, severe dehydration, or urinary tract blockage. In dogs specifically, two causes worth knowing about are:
- Leptospirosis - a bacterial infection spread through contaminated water or soil, including puddles and rivers. Vaccination is available and highly recommended for dogs that spend time outdoors in at-risk areas.
- Grape and raisin toxicity - even small amounts can trigger sudden kidney failure in dogs. The exact mechanism isn't fully understood, but the effects can be severe.
With prompt treatment and removal of the cause, many dogs with acute kidney failure can make a full recovery.
Chronic kidney disease (CKD)
Chronic kidney disease in dogs is the gradual, irreversible loss of kidney function over time. It may develop from the same causes as an acute injury, or from age-related decline, breed-related factors, or immune system problems.
Are some dog breeds more prone to kidney disease?
Yes - certain breeds have a genetic predisposition to kidney problems:
- Bull Terriers and Miniature Bull Terriers - hereditary nephritis, affecting the kidneys' filtering units
- Samoyeds - X-linked hereditary nephropathy
- Cocker Spaniels - hereditary nephritis
- Soft-Coated Wheaten Terriers and Doberman Pinschers - protein-losing nephropathy
- Bernese Mountain Dogs - higher rates of kidney-related disease
If your dog is one of these breeds, it's worth talking to your vet about early screening - catching any issues before symptoms appear gives you the best shot at managing the disease effectively.
What are the signs of kidney disease in dogs?
When the kidneys aren't working as they should, it sets off a "domino effect" in your dog's body. Here's what's happening behind the scenes:
- Difficulty staying hydrated: damaged kidneys can't concentrate urine properly, so your dog loses too much water when they urinate. This dehydration unfortunately makes dog kidney disease worse.
- Phosphorus buildup: healthy kidneys keep phosphorus levels in check. When they fail, phosphorus builds up in the blood, acting like a toxin that speeds up disease progression.
- Toxic waste accumulation: a major job of the kidney is to filter waste from dietary protein. When this filter breaks down, uraemic toxins stay in the blood instead of being flushed out, causing nausea, vomiting, and lethargy.
- Secondary health issues: kidneys also help regulate blood pressure, so kidney disease can lead to hypertension and heart problems. Many dogs also lose muscle mass and become quite thin.
The symptoms of kidney disease in dogs can include:
- Increased thirst
- Increased urination
- Loss of appetite
- Weight loss
- Vomiting
- Lethargy
If you notice any of these symptoms in your pet, check with your veterinarian. They can do blood and urine tests to check your pet's kidney function.
What are the stages of kidney disease in dogs?
Vets use the IRIS (International Renal Interest Society) staging system to classify the severity of chronic kidney disease in dogs. There are four stages, from Stage 1 (early, minimal loss of function) through to Stage 4 (advanced kidney failure in dogs). The stage your dog is at guides treatment decisions, including diet choices, medications, and how frequently they need check-ups.
Your vet will use blood creatinine and SDMA levels, along with urine protein measurements and blood pressure readings, to determine your dog's IRIS stage.
How is kidney disease in dogs managed?
Unfortunately, chronic kidney disease is permanent and progressive. It can't be cured. The management of kidney disease in dogs is focused on slowing progression and reducing symptoms to improve quality of life. Treatment depends on the stage of disease and may include a combination of dietary changes, fluid therapy, medications, and regular monitoring.
What's the best kidney diet for dogs?
Nutrition is the cornerstone of managing kidney disease in dogs. A prescription kidney diet for dogs is specifically formulated to support kidney function. These diets contain carefully controlled levels of high-quality protein to reduce uraemic toxins, and are significantly lower in phosphorus than standard dog foods.
Why does phosphorus restriction matter more than protein restriction? When the kidneys fail, phosphorus builds up in the blood and actively drives disease progression. Research suggests that phosphorus restriction has a bigger impact on slowing chronic kidney disease than protein restriction alone. While lowering dietary protein does help reduce uraemic toxins, protein is also needed for muscle maintenance. The goal isn't to cut it as low as possible, but to find the right balance. A prescription renal diet is formulated to get both right.
This is also why a standard low-protein senior food isn't an adequate substitute. It doesn't control phosphorus the way a prescription diet does.
For a full guide to choosing the right food, see our Best Food for Dogs with Kidney Disease article.
How do I keep my dog with kidney disease hydrated?
Dogs with chronic kidney disease are prone to dehydration, and increasing water intake is an important part of management. It may also help slow disease progression.
Make sure your dog always has access to fresh water. One of the easiest ways to boost fluid intake is to offer the wet food variety of their kidney diet. A pet water fountain is also worth considering, as many dogs prefer running water.
Why is regular veterinary monitoring so important?
As chronic kidney disease is a progressive, lifelong condition, regular check-ups with your vet are essential. These visits allow your vet to monitor how the dog kidney disease is progressing and pick up on any complications early.
Kidney disease in dogs can lead to secondary conditions like high blood pressure and anaemia. Your vet may prescribe medication to help manage these alongside dietary changes.
In summary: a diagnosis of chronic kidney disease is a lifelong journey, but one that can be managed effectively with the right approach. A tailored kidney diet, good hydration, and regular vet check-ups are the foundations, and every small adjustment you make helps your dog feel their best for longer.
FAQs
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History
Our experts continually monitor the health and wellness space and we update our articles when new information becomes available.
Thu 6 Aug 2026
Edited by Dr Gillian Hill BVSc (Hons)Dr Teagan Lever BVSc (Hons)
Head Veterinarian, BVSc (Hons)
Pet Circle's Head Veterinarian, Dr Teagan graduated from the University of Queensland in 2010 and went on to work in small animal and mixed practice in various locations around QLD & ACT before joining Pet Circle in early 2016. Dr Teagan has special interests in dermatology, nutrition and preventative health care. She feels privileged to witness the special bond people share with their pets on a daily basis and enjoys forming lasting relationships with pet parents and their fur children.
