Feeding a Senior Cat: What Changes After Age 10

Cats are generally considered senior around age 10–11 and geriatric past 15, though individual health matters more than the number. Nutritional needs shift in ways that surprise a lot of owners — mainly because the instinct is to feed an older animal less, when many senior cats actually need more protein, not less.

Protein: don't restrict it by default

Older cats can lose lean muscle mass even while staying at a stable body weight, a condition sometimes called sarcopenia. Unless a vet has diagnosed kidney disease and specifically recommended protein moderation, senior cats generally benefit from a high-quality, high-protein diet to help preserve muscle.

Weight can drift in either direction

• Weight gain is common in middle-aged, less active cats — portion control and interactive feeding (puzzle feeders) help.
• Weight loss in a senior cat is more concerning and often signals an underlying issue: hyperthyroidism, kidney disease, dental pain, or diabetes are all common in older cats and can each cause unintentional weight loss even with a normal or increased appetite.

Any unexplained weight change of more than about 10% in a senior cat is worth a vet visit rather than a diet adjustment alone.

Hydration becomes more important

Kidney function naturally declines with age in many cats. Leaning more heavily on wet food, and adding a water fountain (many cats prefer moving water), supports kidney health and can make early-stage kidney disease more manageable if it's diagnosed.

Dental pain changes eating behavior

A senior cat that suddenly prefers wet food, drops kibble while chewing, or eats less enthusiastically may be dealing with dental disease rather than pickiness. Dental checks become more important with age, since tooth pain is a common and under-recognized cause of reduced eating.

Any senior cat that stops eating for more than 24 hours needs prompt veterinary attention — cats, unlike some other animals, can develop a serious liver condition (hepatic lipidosis) from even a few days of not eating, especially if overweight.

A simple senior-year checklist

1. Twice-yearly vet visits instead of annual, since age-related conditions progress faster than in younger cats.
2. Bloodwork to catch kidney and thyroid changes early, often before symptoms appear.
3. Easy access to food, water, and a low-sided litter box if arthritis is limiting mobility.
4. A consistent feeding routine — appetite is one of the most useful early warning signs you have.