Housing dwarf hamsters in pairs: a false good idea?
Published by Planète Pets · managing editor: Clément Lacaille · how our guides are written
In some pet shops, two dwarf hamsters still share the same tank, which suggests they naturally cohabit. Yet a veterinary study published in 2023 in the Veterinary Record by Hedley and colleagues, looking at dwarf hamster housing, found a high rate of cohabitation failure, especially after six months of age, with fights that can escalate to serious injury (see the study). Find our other pointers in the bedding and habitat section.
Contents · 4 sections
What the study found
The authors surveyed dwarf hamster owners and found that cohabitation, even between littermates raised together since weaning, frequently breaks down as the animals age. Territoriality increases with sexual maturity, and females are not spared: they can be even more aggressive than males. The risk is not anecdotal, it is documented.
Why cohabitation goes wrong
The dwarf hamster is a solitary animal in the wild that defends a territory even in captivity. Two individuals in the same cage will almost always end up fighting over food, hideouts and floor space, especially when the footprint is limited. A fight between animals this small can be fatal within minutes, faster than an owner can step in.
How to house one safely
The safest option remains solo housing, with at least 50 to 80 cm of floor length, a quiet wheel sized for the species, and several hideouts so it can structure its territory without having to defend it against a cage-mate. Compare options in wire cage or tank for hamster and add a digging box, which keeps a solo hamster far busier than a cage-mate ever would. To learn more about the species, see its dwarf hamster profile.
Frequently asked questions
Can two littermate dwarf hamsters stay together?
The risk exists even between siblings raised together: cohabitation often deteriorates with age, according to Hedley et al. (2023). Solo housing remains the safest choice.
How do you know cohabitation is going wrong?
Repeated chasing, high-pitched squeaking, pulled fur or injuries are warning signs: separate the two animals into different cages immediately.
Does a solo dwarf hamster get bored?
No: it is naturally solitary. A well-furnished space with a wheel and a digging area meets its needs without a cage-mate being necessary or advisable.
An accessory from our shop for this use: Cosy hanging plush nest for hamsters and small rodents (€17.90) · the whole shop
An accessory from our shop for this use: Electric pet heating pad 45 × 45 cm (17.7 in) with chew-resistant cord ($48.90, ships from the US) · the US shop
This guide is part of Planète Pets’s Rodents universe. Our advice is general in nature: for any health concern, your veterinarian remains the only reference.
