Adult cat care: the complete guide

The adult years in cats are deceptively quiet. The cat eats, sleeps, uses the tray, accepts a brush, and seems indestructible. This is exactly when most owners stop watching closely and when most of the conditions that will show up in old age start their silent progression — chronic kidney disease, dental disease, obesity, hyperthyroidism, diabetes.

Annual vet checks matter more in cats than dogs because cats hide illness so well. By the time a cat looks sick, the underlying condition has often been present for months. Bloodwork from age 5 onwards changes this; a urinary check, a body-condition check, and a thyroid check catch most of the silent progressions early.

The two biggest leverage points in adult cat care: **weight management** (cats are even more sensitive to obesity than dogs — diabetes, hepatic lipidosis, and joint disease all stack up) and **hydration / urinary support** (urinary obstruction in male cats is a top-five emergency).

The annual wellness exam

Once a year, every year. Weight, body condition, dental check, thyroid palpation, hydration, lymph nodes, joints, abdominal palpation. Bloodwork (including T4 thyroid) and urinalysis from age 5 onwards — these catch hyperthyroidism, early kidney disease, and diabetes years before symptoms.

Vaccinations move to a 3-yearly cycle for core feline vaccines in adults, with FeLV in outdoor-access cats and Bordetella in cattery-going cats reviewed annually. Discuss with your vet — many practices now use serology to decide on boosters.

Weight and body condition

Adult cats should have a clearly visible waist behind the rib cage from above, a slight tuck-up from the side, and ribs palpable through a thin fat layer. The "cat belly pouch" (primordial pouch) is normal and not an indicator of weight; the side waist is.

Most adult cats are sedentary indoor athletes whose calorie needs are far lower than the label suggests. A 5kg lean indoor cat usually needs 200–250 kcal per day; many free-fed cats consume 50–80% more.

Solutions: meal feeding rather than free feeding, food puzzles, weighed portions, treats as part of the daily allowance not on top of it. Weight loss in an overweight cat must be slow — too fast and hepatic lipidosis becomes a real risk. Aim for 1–2% body weight loss per week, supervised by a vet for cats more than 20% overweight.

Dental health

Around 70% of cats have dental disease by age 3. The most common cat-specific problem is resorptive lesions — painful holes in the tooth that the cat hides until they cannot eat hard food.

Daily tooth brushing with cat-safe toothpaste is the gold standard. Most cats won't tolerate it; weekly is meaningfully better than nothing. Dental chews and water additives help marginally. Professional dental scaling under anaesthesia every 1–2 years remains the cornerstone, especially in cats over 5.

Signs of dental pain in cats are subtle: dropping food, eating only soft food, chewing on one side, increased drool, pawing at the mouth. Many "fussy eater" cats are actually painful eaters.

Litter habits and urinary monitoring

Litter-tray patterns are the single most useful thing you monitor as an adult-cat owner. Note: frequency, volume, colour, straining, vocalising. Pet Capsule's daily log was built partly around this.

Sudden changes — going outside the tray, frequent small visits, crying in the tray, visible blood — are urinary disease until proven otherwise and are an emergency in male cats. Urinary obstruction kills within 24 hours.

Reduce risk with: hydration (wet food, multiple water sources, pet fountains), low-stress environment, plenty of clean trays in separate locations, vertical territory (climbing posts), and weight management. Stress and dehydration are the two biggest controllable risk factors.

Behaviour and enrichment

Adult cats commonly develop behavioural patterns that owners read as "just being a cat" — over-grooming a particular spot, hiding more, becoming reactive to a new pet — and which are usually communicating something. Pain, boredom, stress, dietary issue, or a brewing medical condition.

Daily enrichment: a 10–15 minute interactive play session with a wand toy, food puzzles for at least one meal, tall vertical territory, a window perch, and a cat-only retreat space. Most multi-cat conflicts in homes resolve when each cat has their own resources (food, water, tray, hiding spot, perch) in non-overlapping locations.

Pet insurance and the savings plan

Cat insurance is usually cheaper than dog insurance and meaningfully valuable. The decision is most rational early in adulthood, before any condition emerges. Without insurance, $30–$100 per month into a dedicated pet account covers most common adult-cat events.

Care checklists

Red flags — see a vet today

• Urinating outside the tray or straining in the tray — emergency in male cats
• Weight loss without diet change (hyperthyroidism, diabetes, kidney disease)
• Increased thirst and urination
• Vomiting more than once a month
• Lumps or swellings — most cat lumps need a vet check, more so than dog lumps
• Sudden lethargy or hiding for more than 12 hours
• Dropping food, drooling, or pawing at the mouth

Frequently asked questions

Helpful tools

• Food portion calculator →
• Ideal weight calculator →
• Expense estimator →