Cat Kidney Disease: 7 Early Signs to Watch

Why Early Detection Matters

Chronic kidney disease (CKD) is the leading cause of death in older cats. By the time symptoms are obvious, 75% of kidney function may already be lost. Early detection through regular blood work can add years to your cat's life.

7 Early Warning Signs

1. Increased Thirst

If your cat is drinking noticeably more water and the water bowl empties faster, this is often the first sign of kidney stress.

2. More Frequent Urination

Larger urine clumps in the litter box or more frequent trips indicate the kidneys are losing their ability to concentrate urine.

3. Weight Loss

Gradual weight loss despite normal appetite suggests the body is breaking down muscle tissue.

4. Decreased Appetite

Nausea from toxin buildup makes food less appealing. Your cat may sniff food and walk away.

5. Vomiting

Occasional vomiting can be normal, but frequent vomiting (especially clear liquid or foam) warrants investigation.

6. Bad Breath

A ammonia-like smell indicates uremia — toxins building up in the bloodstream.

7. Lethargy

Increased sleeping and decreased play are subtle but significant changes.

Screening Schedule

Cats over 7: annual blood panel + urinalysis. Cats over 10: biannual screening. Ask your vet about SDMA testing, which detects kidney decline earlier than traditional creatinine tests.