Gerbils are among the most social rodent pets, requiring same-sex companions and large environments to express their natural digging and burrowing behaviours.
Gerbil welfare failures are almost entirely preventable with knowledge: keep them in pairs, provide deep substrate, avoid splitting bonded groups. The declanning phenomenon — where previously bonded gerbils kill each other if separated even briefly — is a welfare catastrophe that catches uninformed owners completely by surprise. A gerbil pair separated for veterinary treatment and reintroduced may fight to the death. Understanding this risk allows prevention through scent-exchange protocols when temporary separation is necessary. Their burrowing drive is intense and genuine; a gerbil that cannot burrow in shallow substrate spends hours in stereotypic corner-digging that is a direct welfare signal.