Chronic Kidney Disease (CKD) is the leading cause of death in cats over 10 -- affecting approximately 30% of senior cats. The kidneys gradually lose their ability to filter waste, concentrate urine, and maintain electrolyte balance. While CKD is not curable, early detection and proper management can add years of quality life.
IRIS Staging System
| Stage | Creatinine | SDMA | Symptoms | Prognosis |
|---|---|---|---|---|
| Stage 1 | Normal (<1.6) | Elevated (>14) | None -- only detected by bloodwork | Years with management |
| Stage 2 | 1.6-2.8 | 18-25 | Increased thirst/urination, mild weight loss | Years with management |
| Stage 3 | 2.9-5.0 | 26-38 | Appetite loss, vomiting, lethargy, weight loss | Months to years |
| Stage 4 | >5.0 | >38 | Severe symptoms, uremic crisis possible | Weeks to months |
Treatment by Stage
All Stages
- Prescription renal diet (Hill's k/d, Royal Canin Renal, Purina NF)
- Increased hydration (wet food, water fountains)
- Regular monitoring (bloodwork every 3-6 months)
Stage 2-3
- Phosphorus binders if phosphorus levels elevated despite diet
- Anti-nausea medication (maropitant/Cerenia) as needed
- Potassium supplementation if low
- Blood pressure monitoring and treatment if hypertensive
Stage 3-4
- Subcutaneous fluids at home (owners can learn to administer)
- Appetite stimulants (mirtazapine)
- Erythropoietin for severe anemia
- More frequent monitoring (monthly bloodwork)
Subcutaneous Fluids at Home
- One of the most effective home treatments for CKD
- Involves injecting 100-150ml of lactated Ringer's solution under the skin
- Takes 5-10 minutes once you learn the technique
- Frequency: every 1-3 days depending on disease stage
- Most cats tolerate it well with gentle handling and treats
- Your vet will demonstrate the technique
Quality of Life Assessment
Use the HHHHHMM Scale to assess quality of life:
- Hurt: Is pain being adequately managed?
- Hunger: Is the cat eating enough?
- Hydration: Is dehydration being managed?
- Hygiene: Can the cat groom itself?
- Happiness: Does the cat still enjoy life activities?
- Mobility: Can the cat move comfortably?
- More good days than bad: The ultimate question
Frequently Asked Questions
How long can a cat live with kidney disease?
With proper management: Stage 1-2 cats often live 3-5+ years after diagnosis. Stage 3 cats typically live 1-2 years. Stage 4 is the most variable -- weeks to months. The key factors are: how early it is caught, compliance with renal diet, hydration support, and managing complications. Some cats diagnosed at Stage 2 live to very old age with excellent management. Regular bloodwork starting at age 7 catches CKD at the earliest, most treatable stage.
