Feeding a dog with kidney failure
A dog with kidney failure typically does best on a diet lower in protein and phosphorus than a standard adult food, since that reduces the amount of waste product the kidneys have to filter. This is not something to work out alone: the right diet, and when to start it, needs to be set by a vet based on your individual dog's test results and stage of disease.
Why the diet changes
Healthy kidneys filter waste products, including those from protein breakdown, out of the bloodstream. When kidney function declines, that filtering becomes less efficient, and a lower-protein, lower-phosphorus diet reduces the workload on kidneys that are already struggling, which is the reasoning behind the specialist renal diets vets commonly recommend for this condition.
These diets are often also adjusted in other ways, such as controlled sodium and added omega-3 fatty acids, aimed at supporting overall kidney health alongside the core protein and phosphorus changes. The exact balance varies between products and between individual dogs' needs.
What this looks like in a real product
Arden Grange's Vetcare Renal range, which we carry, is a dietetic complete feed for adult dogs built around these principles, with protein deliberately restricted and phosphorus kept low, alongside potassium citrate described by the brand as supporting urine alkalising. It is designed to be used under veterinary guidance for either chronic or transient renal insufficiency, rather than fed to a dog without a diagnosis.
A diet like this is a tool a vet directs the use of, adjusting how long it is fed for and monitoring your dog's response with follow-up tests, rather than something to start or stop based on symptoms alone.
Signs worth mentioning to a vet
Increased thirst and urination, weight loss, reduced appetite, vomiting or a dog seeming generally quieter and less energetic than usual can all be associated with declining kidney function, among other conditions. None of these on their own confirms kidney disease, and only a vet, usually through blood and urine tests, can establish what is actually happening.
If your dog has already been diagnosed with kidney disease, sticking closely to the diet and monitoring schedule your vet has set is more important than any general advice found online, since kidney disease varies considerably in severity and the right approach for one dog may not suit another.
What is not appropriate to do at home
Restricting a dog's protein intake without a vet's guidance is not something to attempt on your own, since too little protein can cause its own problems, particularly in a dog whose kidney disease is mild or whose overall condition needs a different balance than a more advanced case would. This is exactly why a blanket 'low protein is always better' approach is not appropriate.
The same goes for any supplement marketed for kidney support: check with a vet before adding anything to a diet that is already being managed for kidney disease, since interactions and appropriateness vary between individual dogs and their specific stage of disease.
Foods formulated for this
Everything below is in stock with us, priced with delivery worked out, and packed and posted by hand in the UK.
Forthglade Cold Pressed Natural Turkey
Cold-pressed turkey kibble for dogs from 2 months, soft enough to mix with water for young pups
£45.99
Forthglade Cold Pressed Grain Free Salmon
Cold-pressed grain-free dry food for dogs, built on fresh and dried salmon
From£16.99
Forthglade Cold Pressed Grain Free Duck
Cold-pressed grain-free duck food with fruit and botanicals, in two bag sizes
From£16.99
Forthglade Cold Pressed Grain Free Chicken
Cold-pressed grain-free chicken food with fruit and botanicals, in three bag sizes
From£16.99
Forthglade Complete Meal Lightly Baked Turkey
A lightly baked complete dry food, 50% turkey, for adult dogs of any breed
From£12.49
Forthglade Complete Meal Lightly Baked Chicken
A grain-free complete dry food for adult dogs, lightly baked and built on 50% chicken
From£12.49
Forthglade Cold Pressed Small Dog Turkey
Cold-pressed grain-free dry food for small dogs and puppies, built on turkey
£16.99
Forthglade Complete Meal Lightly Baked Lamb
A lightly baked complete dry food, 50% lamb, for adult dogs of any breed
From£12.49
Forthglade Cold Pressed Grain Free Turkey
Grain-free cold-pressed turkey kibble for dogs, gentle on sensitive stomachs
£69.69
Harringtons Puppy Turkey & Rice
Complete turkey puppy food with 30% protein and feeding bands by adult weight
£6.49
Harringtons Adult Dog Turkey Veg
Complete dry food for adult dogs with turkey, chicken and salmon oil, 21% protein
From£3.39
Harringtons Adult Dog Salmon & Potato
Complete salmon and potato dry dog food with 21% protein in a 1.7KG bag
£6.25
Common questions
- Can I just buy a low-protein diet without a vet's involvement?
- It is best not to. A diet this specific is meant to be matched to your dog's actual test results and stage of kidney disease, and getting it wrong, including restricting protein when it is not appropriate, can cause its own problems. A vet's diagnosis should come first.
- Will changing the diet cure my dog's kidney disease?
- No, kidney disease in dogs is generally managed rather than cured, and diet is one part of a wider approach a vet may recommend alongside medication and monitoring. The aim of dietary changes is usually to ease the workload on the kidneys and support quality of life, not to reverse existing damage.
- How do I get my dog to eat a renal diet if they don't like it?
- This is a common challenge, and it is worth discussing with your vet, who may suggest trying a different renal recipe or texture, or gradually transitioning over a longer period than usual. Do not abandon the diet and revert to a standard food without checking with your vet first, since that undoes the reason it was recommended.
- Is fresh water still important on a renal diet?
- Yes, constant access to fresh water matters even more for a dog with kidney disease, and any noticeable change in how much they are drinking is worth mentioning to your vet alongside the dietary changes already in place.
Related
Sources
Written against guidance published by UK veterinary and welfare organisations. Always confirm specifics with your own vet.
Written by Matt Garnett, who runs Giddy Pets and is a lifelong pet owner — not a vet. This is general information, not veterinary advice, and it cannot replace an examination by the vet who knows your animal. How we write these guides.