Quick answer: Hamsters must be housed alone. Most sources recommend a cage floor area of at least 100 × 50 cm, with deep bedding; a wheel diameter of 27 cm or more is recommended for Syrian hamsters and 20 cm or more for dwarf hamsters. Do not feed sticky or sharp-edged foods, to avoid blocking the cheek pouches.
Hamsters are small and take up little space, making them one of Hong Kong's most common starter small animals. But 'the smaller the cage, the easier' is a common misconception: hamsters are natural diggers and long-distance runners, and if equipment is too small, problems do not erupt immediately but slowly turn into bar-biting and emotional issues.
For the full version on temperature, substrate and socialisation rhythm, see the hedgehog breed guide.
Basic facts: dwarf and Syrian hamsters
Hamsters sold in Hong Kong pet shops mainly fall into two groups: the larger Syrian hamster, and various dwarf hamsters such as Campbell's, Djungarian and Roborovski. What they share is being solitary, strongly territorial, nocturnal, and not pets that can be held for long periods.
The biggest difference is size: Syrian hamsters are noticeably larger, so wheels and hideouts must match; dwarf hamsters are small but equally active, and the cage must not shrink just because they are small. Most sources mention a lifespan of about two to three years.
Hamsters are also very sensitive to low temperatures. When the room temperature is noticeably low, they may enter torpor (a state of low body temperature and low metabolism), which looks like hibernation but is actually dangerous and requires slow warming. It is generally recommended to keep room temperature at about 20 to 24°C and avoid direct air-conditioning or warm-air drafts on the cage.
Cage size and bedding depth
| Item | General recommendation | Notes |
|---|---|---|
| Cage floor area | At least about 100 × 50 cm | Applies to all species; levels and tubes not counted |
| Bedding depth | At least 15 to 20 cm | Deeper is better for digging and nesting |
| Bar spacing | About 1 cm or closer | Dwarf hamsters need closer spacing to prevent escape |
| Wheel diameter | Syrian 27 cm or more | Back stays straight while running |
| Wheel diameter | Dwarf 20 cm or more | As above, still depends on individual body length |
| Drinking water | Water bottle or bowl | A bottle wets the bedding less |
Wire cages have good ventilation but bedding is easily kicked out; plastic bins hold warmth better but need ventilation holes added; glass tanks have the poorest ventilation. Position the cage away from direct sunlight through windows, air-conditioning vents and sources of vibration.
Bedding can be dust-free paper cotton, paper bedding or aspen shavings; avoid loose cotton (fibres can wrap around limbs and teeth), pine or fir shavings containing volatile oils, and scented or dyed bedding. Deep bedding is one of the most important welfare needs for hamsters, as digging and nesting are natural behaviours.
Wheels and cage setup
A wheel is essential, not an accessory. There are two hard requirements when choosing a wheel: the running surface must be solid (metal or hard plastic), as wire or mesh can trap toes and cause foot injuries with long-term use; the diameter must be large enough so the hamster's back stays straight while running. Generally, 27 cm or more is recommended for Syrian hamsters and 20 cm or more for dwarf hamsters, with larger individuals needing more.
The cage should ideally have several hiding places, tunnels, chew wood or a mineral block, and a sand bath — a sand bath helps reduce greasy fur, but the sand must be kept dry. A water bottle has the advantage of not wetting the bedding.
Also, exercise balls look convenient, but they have poor ventilation, the hamster cannot control direction, and they easily bump into furniture or fall down stairs, so long use is not recommended.
Diet and pouch safety
The staple should be a hamster-specific mixed food, mainly pellets with a small amount of seeds. A pure seed diet easily leads hamsters to pick out high-fat sunflower seeds and leave the pellets, causing nutritional imbalance. The portion is generally about one tablespoon per day to start, with treats counted in the total. Hamsters have a natural hoarding instinct and will stash food in the nest or corners, so check stored food regularly for dampness and mould.
Fresh vegetables can be fed in small amounts, fruit only as an occasional treat; chocolate, onion and garlic, grapes and raisins, avocado, alcohol and high-salt, high-sugar processed foods should never be fed.
The cheek pouch is the part you need to watch most. Hamsters stuff food into their pouches to carry back to the nest, so sticky and sharp-edged foods are the most dangerous: banana, peanut butter and syrups stick to the pouch lining, while biscuit crumbs, hard nut shells and thorny plants can scratch it. Do not press or dig into the pouch forcibly. If the pouch becomes swollen, asymmetrical, smelly or leaks fluid, see a veterinarian.
Teeth, skin and common illnesses
| Sign | Possible cause | Action |
|---|---|---|
| Drooling, refusing food, eating very slowly, weight loss | Overgrown incisors or malocclusion | Have a veterinarian handle it; do not cut teeth yourself |
| Intense itching, local hair loss, heavy dandruff | External parasites such as mites | Veterinary diagnosis and prescription, plus thorough cage cleaning |
| Circular hair loss, skin crusts | Skin fungus, some can be transmitted to humans | Do not self-medicate; have a veterinarian test |
| Diarrhoea, wet tail area, lethargy, huddled in a corner | Wet tail, mainly seen in young Syrian hamsters | Treat as an emergency and seek veterinary care immediately |
| Runny nose, sneezing, noisy breathing | Respiratory problem | See a veterinarian as soon as possible |
| Lumps on the body | Common hamster tumours or abscesses | Requires veterinary assessment |
Teeth are the most prone to problems: incisors grow continuously and must be worn down with chew wood or a mineral block. If you notice slow eating, dropping food or drooling, act immediately, because dental problems quickly lead to malnutrition. For skin, neither mites nor fungus should be treated with self-bought ointments: the dose is hard to control, and a wrong diagnosis delays treatment.
Hong Kong-specific notes: humidity, air-conditioning and power cuts
Humidity and bedding storage. During Hong Kong's returning-south dampness and rainy season, humidity is high and bedding quickly absorbs moisture; mould then increases the risk of skin fungus and respiratory problems. The approach is to buy bedding in small batches, store it airtight with desiccant, replace it as soon as it is damp, and replace the whole batch of sand bath sand if it clumps from moisture. Food should also be stored airtight; after opening, transfer to an airtight jar and do not keep it in the bathroom or by a window.
Temperature and air-conditioning. In summer, watch for heatstroke risk and do not place the cage on a windowsill; direct air-conditioning causes fluctuating temperatures in the cage, and in winter low temperatures also require watching for torpor. Power cuts in summer can quickly raise the flat's temperature, so avoid placing the cage by unshaded windows.
Living environment constraints. Hamsters are nocturnal, and a wheel turning at midnight can be quite loud, so consider family and neighbours when choosing a location. It is best to ask in advance about pet restrictions in the lease or building deed, and whether the flat has room for a cage of 100 × 50 cm or more. Also, not every clinic in Hong Kong has experience with hamsters, so call ahead to confirm.
Common beginner mistakes
- Buying two hamsters for the same cage, thinking they will keep each other company, only for them to fight and get injured.
- Using a small commercial cage with a floor area far below 100 × 50 cm.
- Spreading only a thin layer of bedding, leaving no room to dig or nest.
- A wheel that is too small or has a wire surface, causing the back to curve and toes to be trapped.
- Feeding sticky or sharp-edged foods that block or scratch the cheek pouch.
- No chew items, only discovering overgrown teeth when drooling or food refusal starts.
- Not storing food and bedding airtight, so they go mouldy in the humid season.
- Thinking an exercise ball can replace the cage wheel and free activity time.
- Not weighing regularly, only noticing problems when the hamster is clearly overweight or refusing food.
Key points
- ✅ One hamster per cage. Hamsters are solitary animals; sharing a cage only brings fighting and stress.
- ✅ Floor area at least about 100 × 50 cm, not counting levels and tubes.
- ✅ Bedding at least 15 to 20 cm deep; deeper is better for digging and nesting.
- ✅ Wheels must have a solid surface: Syrian 27 cm or more, dwarf 20 cm or more.
- ✅ In Hong Kong's humid season, store food and bedding airtight and replace as soon as damp.
Related reading
- Hong Kong pet care overview (cats, dogs, small animals, aquatics, reptiles, birds)
- Hedgehog care guide: temperature, substrate and diet
- Guppy care guide: cycling and water quality
- PetChill pet supplies
This article is for reference only and cannot replace veterinary diagnosis, prescription or treatment. Hamsters are small with fast metabolisms, and their condition can deteriorate faster than cats and dogs; do not wait when diarrhoea, food refusal or abnormal breathing appears.
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