Do Small Pets Need a Companion?
🤎 The short version: for most small pets, company isn’t optional — it’s a welfare need. Some must live in company (rats, guinea pigs, gerbils, mice, degus, chinchillas, sugar gliders; rabbits do best bonded), one famously must live alone (the hamster), and a few are “it depends.” Getting this wrong is one of the most common — and most serious — small-pet mistakes. Not sure about your species? The needs-a-friend tool answers it directly.
Why it matters so much
Loneliness and forced togetherness are both real welfare problems. A social animal kept alone can become depressed and develop abnormal behaviour; an animal that needs to be solitary, forced into a “pair,” may fight — sometimes fatally. So “one or two?” is a question to answer before you buy, not after.
Must have company
These species are social and should never live alone:
- Rats — intensely social; a lone rat can become depressed even with lots of human attention. Same-sex pairs or groups.
- Guinea pigs — herd animals; keeping just one is even illegal in some countries.
- Gerbils — clan animals (but watch for declanning).
- Mice — social; females group well (males are the exception — see below).
- Degus — colony animals.
- Chinchillas — social; keep with a compatible companion.
- Sugar gliders — colony animals; a lone glider can become stressed and self-mutilate.
- Rabbits — do best bonded with another (usually neutered) rabbit.
Must live alone
- Hamsters — Syrian and Chinese hamsters must live singly; they’re solitary and fight if housed together. A single hamster in a big cage is happy, not lonely.
- Hedgehogs — solitary; kept one to a cage.
It depends
- Dwarf hamsters — can sometimes live in same-sex pairs formed young, but don’t need to and often fall out. Optional, with a separation plan.
- Ferrets — usually enjoy company (a “business”), but a single ferret can be happy with lots of daily human interaction.
- Male mice — often can’t be housed together (they fight); the safest male groups are litter brothers grouped young and never disturbed.
Two rules that always apply
- Same species only. Keep rabbits with rabbits, guinea pigs with guinea pigs — not together, as a rabbit can injure a guinea pig.
- Enough resources for everyone. For any group, give as many hides, bowls and water points as animals, plus one, so no individual is bullied.
The honest takeaway
Decide the social side before you choose: if you can’t keep a pair or group of a social species, pick a solitary one (a single hamster) instead of keeping a social animal alone. Check your species with the needs-a-friend tool, and see the care guides for how to introduce and bond them.
Sources & further reading
- Hayfold — needs-a-friend tool and species care guides — per-species social needs.
- RSPCA — pets — companionship guidance behind each species’ rule.
Common questions
Which small pets need a companion?
Rats, guinea pigs, gerbils, mice, degus, chinchillas and sugar gliders are social and should never live alone, and rabbits do best bonded with another rabbit. For these species, a companion of their own kind is a welfare need, not an optional extra.
Which small pets should live alone?
Hamsters are the main one — Syrian and Chinese hamsters must always live singly, and even dwarf species don’t need company and often fall out. Hedgehogs are also solitary and kept one to a cage.
Can human company replace another animal?
No — for social species, human attention is a poor substitute for a companion of their own kind. If a social animal must temporarily live alone, daily human interaction helps, but the goal should be appropriate same-species company.
Does a companion have to be the same species?
Yes. Keep rabbits with rabbits, guinea pigs with guinea pigs, and so on. Different species have different diets, body language and needs — for example, rabbits and guinea pigs shouldn’t be housed together, as a rabbit may bully or injure a guinea pig.