Switching Food by Life Stage: what should I do first?

When to switch from kitten food to adult food: Either at 12 months of age (1 year) or right after spay / neuter surgery (around 6–7 months of age)—whichever comes first. After surgery, transition promptly to a spayed/neutered formula. When to switch from adult food to senior (middle-aged) food: Age 7 is the benchmark. Switch to a senior diet with controlled phosphorus and sodium levels and added antioxidants to support the kidneys and joints. When to switch from senior food to super senior food: Ages 11–13. From this stage onward, the goal flips to preventing weight and muscle loss—choose a highly digestible, slightly higher-calorie super senior diet with softer kibble.

What should I avoid doing?

Continuing to feed high-protein, high-calorie, high-mineral kitten food to a senior cat aged 7 or older (this puts heavy strain on the kidneys and urinary tract). / Conversely, letting a growing 3-to-4-month-old kitten eat a housemate cat's adult maintenance food, weight-loss diet, or renal prescription diet (which causes stunted bone and organ development).

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When to Switch Cat Food from Kitten to Adult and Senior: Key Timing

🚨 Check first

If you keep feeding high-calorie kitten food in generous amounts until 12 months of age to a kitten that was spayed or neutered at 6 months old just because 'they are not 1 year old yet,' they can easily become overweight before their first birthday.

📌 The answer in 3 seconds

When to switch from kitten food to adult food: Either at 12 months of age (1 year) or right after spay / neuter surgery (around 6–7 months of age)—whichever comes first. After surgery, transition promptly to a spayed/neutered formula.
When to switch from adult food to senior (middle-aged) food: Age 7 is the benchmark. Switch to a senior diet with controlled phosphorus and sodium levels and added antioxidants to support the kidneys and joints.
When to switch from senior food to super senior food: Ages 11–13. From this stage onward, the goal flips to preventing weight and muscle loss—choose a highly digestible, slightly higher-calorie super senior diet with softer kibble.

📊 Flowchart

Step 1Once your kitten has spay / neuter surgery around 6 months of age, transition from kitten food to a spayed/neutered adult formula over 10 days around the time stitches are removed.
Step 2When your cat turns 7, get a wellness checkup (blood and urine tests); if results are normal, switch to a commercial '7+ senior' diet, or if early kidney or urinary changes appear, switch to an early-care diet recommended by your vet.
Step 3Once your cat passes age 11 or 13 and their weight begins to dip slightly, switch from a lower-calorie 7+ formula to a high-digestibility, nutrient-dense 11+, 13+, or 15+ super senior diet paired with wet food.

⭕ Step-by-step fix

Step 1 · What you can do at home right now
Once your kitten has spay / neuter surgery around 6 months of age, transition from kitten food to a spayed/neutered adult formula over 10 days around the time stitches are removed.
Step 2
When your cat turns 7, get a wellness checkup (blood and urine tests); if results are normal, switch to a commercial '7+ senior' diet, or if early kidney or urinary changes appear, switch to an early-care diet recommended by your vet.
Step 3
Once your cat passes age 11 or 13 and their weight begins to dip slightly, switch from a lower-calorie 7+ formula to a high-digestibility, nutrient-dense 11+, 13+, or 15+ super senior diet paired with wet food.

❌ Never do this

Continuing to feed high-protein, high-calorie, high-mineral kitten food to a senior cat aged 7 or older (this puts heavy strain on the kidneys and urinary tract).
Conversely, letting a growing 3-to-4-month-old kitten eat a housemate cat's adult maintenance food, weight-loss diet, or renal prescription diet (which causes stunted bone and organ development).

📋 Make notes for the vet

Your notes save automatically on this device, so they stay even without a signal at the clinic.

Your cat

Since when

Symptoms and things to tell the vet

Your cat's exact current age (or estimated age) and whether they have had spay / neuter surgery.
Current body weight and Body Condition Score (BCS on a 1–5 scale).

Urine

Stool

Photos and items to bring

Notes (breathing rate, amount eaten, times, etc.)