Hamster — care sheet

Beginner. Genuinely beginner-friendly once you ignore what the pet shop sells you. Hamsters are solitary (most should live completely alone), and they need a far bigger cage with much deeper bedding than the tiny cages marketed for them. Get the enclosure and the “no cage-mates” rules right, and the day-to-day care is simple.

A good-quality, varied hamster diet — a complete compound pellet or a proper hamster seed/grain mix — reflecting their natural mix of seeds, cereals and some insect protein. Hamsters cheek-pouch and hoard food, sitting up to gnaw it, so expect a food stash in the nest. Provide constant fresh water, ideally from a small-diameter or valveless sipper bottle (hamsters can’t suck hard against a stiff ball-valve), checked daily. Avoid sudden diet changes and stale food, which upset their gut.

Far bigger than the cages sold for them, with a solid floor (never wire mesh — it injures feet) and, above all, a deep layer of bedding so they can dig the burrows they’re built for. A secure plastic or glass tank, or a barred cage with narrow spacing and a raised lid, works — never a wooden cage, and never anything a determined escape artist can squeeze out of. Add a dark nesting box (ideally floorless so you can check them), an area of deep substrate or coarse sand to burrow, and multiple hides. Keep it away from things that make ultrasound (TVs, screens, running water), which hamsters find stressful.

Most hamsters are solitary and happiest alone. Syrian and Chinese hamsters must always live on their own. Some dwarf species (Roborovski, Winter White, Campbell’s) can sometimes live in same-sex pairs or trios if littermates are grouped young and stay harmonious — but they don’t need company to be happy, and pairs often fall out later, so you must be ready to house them separately. Fighting is serious (hamsters don’t play-fight); separate permanently and don’t reintroduce. Don’t even house males close to each other, and never mix species or sexes.

Keep hamsters indoors, warm and out of draughts and damp — outdoor cold is dangerous. If they get too cold they can slip into a hibernation-like state called torpor, which is risky because domestic hamsters don’t carry the fat reserves to survive long without food. If a hamster does go stiff and cold, warm it gently and offer food and water, and call a vet if unsure.

A deep, generous layer of safe bedding over a solid floor — deep enough to dig and tunnel in, topped with nesting material such as plain paper. Coarse sand is a good natural burrowing/bathing substrate. Never use cotton-wool or fluffy strand “fibre” bedding: it can be swallowed or wrap around limbs and cost a hamster its foot. Spot-clean every few days and do a fuller clean only about once or twice a month, saving a little unsoiled bedding for familiar scent — over-cleaning stresses them.

Hamsters are nocturnal and astonishingly active — a wild hamster can run several miles a night — so give plenty of space plus a good solid wheel: large-diameter (a rat-sized wheel), axle-free and with a non-slip surface, but not the only enrichment. Add deep substrate to burrow, tunnels, sand to dig, and safe things to gnaw (their teeth grow continuously). Scatter-feeding suits their natural hoarding and foraging.

Hamsters groom themselves and rarely need bathing — a shallow sand bath helps keep the coat clean; long-haired Syrians benefit from gentle brushing to prevent matting. Provide gnaw items so the continuously-growing teeth wear down, and have a vet trim overgrown teeth or nails if needed. Check cheek pouches and rear end stay clean.

None needed on a good-quality, varied hamster diet. Avoid loading them with sugary or fatty treats — dwarf hamsters in particular are prone to weight and blood-sugar problems.

Syrian (the common “teddy bear”) hamsters are about 15–20 cm (6–8 in) long and weigh roughly 110–140 g; dwarf species (Roborovski, Winter White, Campbell’s, Chinese) are noticeably smaller.

Short — typically 18 months to 3 years as pets. A hamster is a big responsibility packed into a brief life.

See a small-animal or exotics vet if you notice: A wet, soiled or matted rear end with diarrhoea, low energy and loss of appetite — “wet tail” (often proliferative ileitis) progresses fast and is frequently fatal; see a vet urgently; Not eating, weight loss, or a hunched, low-energy hamster; Rapid or laboured breathing, or a bluish tint to skin or gums (possible heart failure in Syrians); Any lump or swelling, or overgrown front teeth; A hamster that is cold and stiff (torpor) — warm it gently and seek advice; Sudden diet-related diarrhoea, or diarrhoea after any medication (some antibiotics are fatal to hamsters).