This description of dwarf hamsters starts with the senses, because nearly every piece of care advice makes more sense once you know how a dwarf hamster hears, smells, sees and feels its way around. The care points below come from the RSPCA's hamster pages. The research comes from published studies on two dwarf species, Phodopus sungorus and Phodopus campbelli.
Three of the five pet hamsters are dwarfs
The RSPCA lists five hamsters as the ones most commonly kept as pets: the Syrian, the Chinese, Campbell's Russian dwarf, the winter white dwarf and Roborovski's dwarf. Hamsters usually live for up to two years, although some live longer. In the wild they are burrow-digging rodents of dry, rocky plains and lightly vegetated slopes, and they build their nests inside the burrows.
The fact that matters most for this article is a simple one. Hamsters are prey animals. The RSPCA says they are generally nervous of new sights, sounds and smells, and they go back to their burrow when they feel afraid. Their senses are tuned for spotting danger, and a pet cage is full of things those senses pick up.
Hearing: a dwarf hamster talks above our range
The RSPCA describes hamsters as having well-developed hearing that helps them detect predators. They are very sensitive to high-frequency sounds that we can't hear, and they can find those sounds stressful.
Dwarf hamsters also make sounds in that range. A 2024 University of Oxford study recorded adult Djungarian hamsters (Phodopus sungorus) over long periods, some housed alone and some in same-sex sibling pairs. The hamsters produced ultrasonic calls with a peak frequency of 57 kHz. Calling rose and fell with activity: there were more calls in the dark period, when the animals were busier, with peaks around the times the lights changed. The authors found little evidence that these calls had a direct social job.
A 2015 Indiana University study on the same species, which it calls the Siberian hamster, recorded pairs during same-sex aggressive encounters. There the ultrasonic calls showed the caller's sex, while a second, broadband type of call went with aggression. Hamsters kept on short days that were not in breeding condition made more of those broadband calls, and were more aggressive, than hamsters in breeding condition.
For the owner, the RSPCA turns this into a placement rule. Keep the cage away from things that give off ultrasound, such as televisions, computer screens, vacuum cleaners and running water. A quiet room where the hamster can rest undisturbed is the starting point.
Smell: news, warnings and home
The RSPCA names smell alongside hearing as a well-developed sense that helps hamsters detect predators. It adds that smell is really important for social communication.
A 2015 study tested dwarf hamsters of the species Phodopus campbelli that had never met a predator. In a Y-shaped maze they were given a choice between urine odours from ferrets raised on different diets. The hamsters could easily tell apart the urine of ferrets fed on mice from that of ferrets fed on hamsters. The authors believe it may be the first report of a prey species telling apart the odours of an unknown predator according to what it had been fed.
That fits the RSPCA's advice on other pets. Hamsters can find the presence and scent of other animals stressful, especially predators such as cats or dogs, so other pets should not be able to reach the hamster or its cage.
Smell shapes cleaning too. The RSPCA asks owners not to let bedding become damp or smelly, and to spot clean soiled bedding, uneaten food and droppings every few days. When you clean out the cage, put back a small amount of old, unsoiled bedding and nesting material, especially if the hamsters live in a group.
Sight: built for dim light
Hamsters are nocturnal. According to the RSPCA they have large eyes and a retina dominated by rods, the cells that can work in less intense light. They are also capable of UV vision. In other rodents that trait is thought to help with social communication and twilight vision, though the charity notes it is little understood in the hamster.
Lab work on the Siberian hamster backs up the unusual eyes. A 2002 study found that every cone in its retina contains two visual pigments, not one. Chemists at Yale have also studied a Siberian hamster ultraviolet cone pigment in detail.
The housing advice follows from those eyes. The RSPCA asks for a room where the lights go off at more or less the same time each night, without erratic lighting hours, and warns that hamsters are sensitive to bright sunlight. The nesting box should be dark inside, and some boxes have an angled entrance tube to keep light out. During the day a hamster needs to sleep undisturbed.
Touch: whiskers and hands
Hamsters explore with their whiskers, which help them sense objects around them. The RSPCA says hamster whiskers can vibrate back and forth at up to 30 whisks per second during many different behaviours.
Touch is also how a hamster gets to know you. Let it investigate your hands in its own time. To pick it up, cup it with two hands and then gently open them so it sits on your joined palms. Don't handle a hamster while it is resting or sleeping unless you really must. Daily contact works better than long sessions only at weekends.
Living together and feeding
Dwarfs are the hamsters that can share a cage. The RSPCA says Roborovski, Campbell's Russian and winter white dwarfs can sometimes live in pairs or trios, as long as the groups form early in life and stay stable. Even dwarfs don't need company to be happy, though, and pairs that got on well at first may fall out later. Fights tend to happen at night, hamsters don't play-fight, and hamsters that have fought need to be separated for good.
For food, the RSPCA lists a compound pellet ration or a seed mix made for hamsters, small amounts of greens, cleaned root vegetables, and pieces of fruit such as apples. Grapes and rhubarb should not be given, as they can be poisonous to rodents. Hamsters like to eat hidden away, so food can be scattered or hidden around the cage to encourage natural foraging.
Dates are not on that list. Kurmanabi writes about dates for people, so this page does not suggest them for a hamster; ask a vet before offering anything the RSPCA list leaves out. For dates on your own table, Pemborong Kurma Green Diamond describes itself as a date wholesaler in Shah Alam, Selangor. You can read about Kurmanabi, browse more posts on the Kurmanabi blog, or send a question through the contact page.