Kidney Disease in Dogs: What You Need to Know

Signs of Kidney Disease in Dogs

Kidney disease can be tricky to spot early, which is why regular vet checkups are so important. A simple blood and urine test can confirm kidney function.

Watch for these warning signs:

• Increased thirst and more frequent urination

• Loss of appetite or changes in eating habits

• Unexplained weight loss

• Bad breath or a sore mouth

• Vomiting and diarrhoea

• Low energy, weakness, or sleeping more than usual

• Coat looking dull or lack of shine

• Depression or lack of interest in play and walks

Since many of these symptoms overlap with other illnesses, always seek veterinary advice if you notice any changes.

What Causes Kidney Disease in Dogs?

Just like in humans, dog kidneys can be damaged by a variety of factors, including:

• Injury or trauma

• Infections

• Ingesting toxins (antifreeze, grapes, certain medications, etc.)

• Old age

• Poor diet (especially foods high in phosphorus)

• Genetics — breeds such as Cocker Spaniels, Bull Terriers, and German Shepherds are more prone to kidney issues

Nutrition and Kidney Health

The number one treatment for dogs with kidney disease is a special renal diet. The right food can greatly improve your dog’s quality of life and even extend their lifespan.

A good renal diet typically includes:

• Plenty of water – hydration is essential

• Low protein – reduces waste products for kidneys to filter

• Low phosphorus – prevents dangerous build-up in the blood

• Low sodium (salt) – helps control blood pressure and symptoms

• Omega-3 fatty acids – reduce inflammation and support kidney health

• Palatability – since appetite often decreases, finding tasty food is important

👉 See safe renal-friendly treats here.

Choosing the Best Dog Food for Kidney Disease

When it comes to renal diets, quality matters.

• Avoid cheap commercial foods loaded with fillers, preservatives, and artificial flavours.

• Look for veterinary-approved renal diets—your vet will likely recommend a brand, though you can research alternatives.

• You don’t always need the most expensive option—many mid-range brands also offer excellent renal formulas.

⚠️ Do not feed healthy dogs renal food. They need a different nutrient balance to support overall health.

Foods to Avoid for Dogs with Kidney Disease

Certain foods put extra stress on the kidneys and should be avoided:

• High-protein foods (especially red meat)

• Jerky treats, bones, pig’s ears, rawhide

• Human food (especially salty, sugary, or processed items)

• Tuna (too high in phosphorus)

Safe Vegetables for Dogs with Kidney Disease

Vegetables can be a great addition to a kidney-friendly diet, in moderation:

• Carrots – good for digestion

• Cucumbers – hydrating, low in salt

• Peas – a protein source, but only in small amounts

• Potatoes & Sweet Potatoes – provide energy and B vitamins

❌ Avoid tomatoes, which are high in potassium and oxalates.

Safe Fruits for Dogs with Kidney Disease

Fresh fruits can provide vitamins, antioxidants, and hydration:

• Blueberries & Strawberries – full of antioxidants and fibre

• Watermelon (seedless) – hydrating and kidney-friendly

• Apples (seedless) – help absorb toxins

• Bananas – okay in small amounts, but check with your vet first

Final Thoughts

Kidney disease in dogs can feel overwhelming, but with early detection, the right diet, and regular veterinary care, many dogs go on to live happy, comfortable lives.

You know your dog best—watch their habits closely and always consult your vet about changes to diet or lifestyle.

💬 Have you cared for a dog with kidney disease? Share your experiences in the comments so other pet parents can learn from your journey.

👉 Click here for treats that could be okay for dogs with kidney disease.

Always check with your vet.

📌 Update (May 2025):
There’s been some discussion around peas and cranberries. Both are safe in moderation, but for dogs with kidney issues, it’s best to avoid foods where peas are a major ingredient. Cranberries are fine as an occasional treat. Always check with your vet for personalized guidance.