Pet rats, mice, hamsters, gerbils, and other small mammals are often underestimated as companions but have complex social and behavioral needs that are frequently unmet in conventional pet keeping.
Small mammal welfare is frequently compromised by the assumption that small size means small needs. Rats, despite weighing under half a kilogram, have the same fundamental welfare needs as larger mammals: social connection, behavioral expression, cognitive stimulation, and positive experiences. A solitary rat in a small wire cage with minimal enrichment is suffering welfare deprivation that is as significant as a solitary dog in inadequate housing — the difference is public perception and legal protection, not actual welfare significance. The most impactful interventions for small mammal welfare are social housing appropriate to each species' nature, cage sizes adequate for the species' behavioral repertoire, and substrate depth appropriate for natural burrowing motivation.