Chronic Kidney Disease (CKD)
A gradual, irreversible loss of kidney filtration, waste excretion, and urine concentration ability over months or years.
💬 In Plain English
The kidneys filter metabolic waste from the blood, balance hydration, manage electrolytes, and produce hormones for red blood cells. In chronic kidney disease, functional kidney units (nephrons) slowly wear out and scar over. Because animals cannot concentrate their urine properly, they drink and urinate large volumes to flush toxins. As toxins accumulate, pets feel nauseated, lose weight, develop mouth ulcers, and become anemic.
🔬 Clinical & Technical Depth
For Vets & TechniciansFormal Clinical Definition
Irreversible structural and functional renal damage lasting at least 3 months. Staged according to International Renal Interest Society (IRIS) guidelines based on fasting blood creatinine, symmetric dimethylarginine (SDMA), blood pressure, and proteinuria.
Why Veterinarians Use It
Veterinarians use this diagnosis to differentiate long-standing progressive renal decline from acute kidney injury (AKI) and establish an IRIS management tier.
Clinical Context Encountered
Very common in senior cats (over 30% of cats over 10 years) and older dogs, often identified on routine senior screening bloodwork before severe outward symptoms appear.
Clinical Reference Guide (Medical Condition)
- •Sudden cessation of urination, persistent intractable vomiting, extreme listlessness, or breath smelling of ammonia (uremic breath) requires urgent veterinary hospitalization.
❓ Questions to Ask Your Veterinarian
Take these actionable questions with you to your next clinic visit or appointment:
- 1What IRIS stage is my pet currently in based on creatinine, SDMA, and urine specific gravity?
- 2Has my pet’s urine been checked for protein loss (UPC ratio) and bacterial infection?
- 3Is my pet’s blood pressure normal, or do they require anti-hypertensive medication?
- 4When should we transition to a kidney-supportive diet with restricted phosphorus and high-quality protein?
- 5Would home subcutaneous fluid therapy help maintain hydration?
Academic & Clinical References
- IRIS Staging of CKD in Dogs and CatsOrganization: International Renal Interest Society (IRIS) • Published: 2023-01-01 • Accessed: 2026-01-10http://www.iris-kidney.com/guidelines/staging.html
- ISFM Consensus Guidelines on the Diagnosis and Management of Feline Chronic Kidney DiseaseOrganization: International Society of Feline Medicine (ISFM) • Published: 2016-03-01 • Accessed: 2026-01-10https://icatcare.org