What is Kidney Failure in Dogs?
Dog kidney failure occurs when the kidneys are no longer able to effectively filter waste products from the blood, regulate hydration, or maintain essential mineral balance. This leads to a build-up of toxins in the body, which can impact multiple organ systems.
There are two main types:
- Acute kidney failure – develops rapidly, often due to toxins, infections, or dehydration
- Chronic kidney failure – progresses gradually, commonly associated with ageing or long-term disease
Signs and symptoms of kidney failure in dogs
1. Increased Thirst and Urination
One of the earliest and most noticeable signs of kidney failure in dogs is a change in drinking and urination habits.
- Drinking more water than usual
- Frequent urination or accidents indoors
- Needing to go out overnight
This happens because the kidneys lose their ability to concentrate urine effectively.
2. Loss of Appetite
A reduced interest in food is common as kidney function declines.
- Leaving food unfinished
- Refusing meals entirely
- Becoming selective or fussy with food
Toxin build-up in the bloodstream can cause nausea, making your dog reluctant to eat or finish meals. Over time, this can lead to noticeable weight loss.
3. Lethargy and Low Energy
Dogs with kidney disease often appear tired or less interested in activities they once enjoyed.
- Sleeping more than usual
- Less interest in walks or play
- Appearing weak or withdrawn
This is partly due to toxin accumulation and also because kidney disease can lead to anaemia, reducing oxygen delivery throughout the body.
4. Vomiting and Nausea
As waste products build up in the bloodstream, dogs may experience gastrointestinal upset.
- Occasional or frequent vomiting
- Drooling or lip licking
- Signs of stomach discomfort
These symptoms occur as waste products build up in the bloodstream.
5. Weight Loss
Unintentional weight loss is a common sign of chronic dog kidney failure.
- Gradual or sudden weight reduction
- Muscle loss, especially along the spine
- Reduced body condition despite normal feeding
It often results from a combination of poor appetite, muscle wastage, and ongoing illness.
6. Bad Breath (Uraemic Odour)
Having a distinct, unpleasant smell on your dog’s breath.
- Metallic or ammonia-like smell
- Persistent unpleasant breath despite dental care
This can be a sign of advanced kidney disease. This occurs due to the accumulation of waste products in the blood.
7. Pale Gums
Healthy gums should be a consistent pink colour.
- Gums appearing light pink, white, or dull
- Slower capillary refill time
This can indicate anaemia, which is frequently associated with chronic kidney disease.
8. Mouth Ulcers
In more advanced stages, dogs may develop sores or ulcers in the mouth.
- Visible sores on gums or tongue
- Difficulty eating due to pain
- Increased drooling
These can be painful and further contribute to reduced appetite and discomfort.
9. Changes in Urine Appearance
You may notice that your dog’s urine becomes darker than usual or even contains traces of blood.
- Very clear or very dark urine
- Blood-tinged urine
- Strong or unusual odour
Any change in urine colour, clarity, or frequency should be assessed by a veterinarian.
10. Poor Coat Condition
Dogs with chronic illness often show changes in their coat.
- Dull, dry, or rough coat
- Increased shedding
- Lack of grooming behaviour
A dull, dry, or unkempt appearance can reflect underlying health issues, including kidney disease.
When to Seek Veterinary Advice
Contact your veterinarian if you notice:
- Two or more symptoms occurring together
- Sudden behavioural or appetite changes
- Persistent vomiting or lethargy
- Noticeable changes in drinking or urination
Early testing, such as blood work and urine analysis, can help confirm dog kidney failure and guide treatment.
While kidney disease is often not reversible, early and consistent management can improve your dog’s quality of life.
Common Treatment Approaches
- Prescription kidney-support diets
- Medications to manage nausea and blood pressure
- Fluid therapy for hydration support
- Routine monitoring and follow-up tests
Supporting Dogs with Kidney Disease
Recognising the early warning signs of kidney failure in dogs is essential for timely intervention. Even subtle changes in your dog’s habits or behaviour can signal an underlying issue.
Noticing any of these signs? The vets at Rossmore Vet Hospital are always happy to take a closer look and help you work out what’s best for your dog.