Pet rats are highly intelligent, social animals with complex emotional and cognitive lives that are frequently underestimated, resulting in welfare problems from inadequate housing, companionship, and enrichment.
Rats kept alone or in small, barren cages develop what researchers describe as depression-like states - reduced interest in play, reduced positive responses to normally enjoyable stimuli, and elevated stress indicators. Their intelligence means environmental impoverishment is acutely felt. Social isolation causes particularly severe welfare impacts. Neutering female rats significantly reduces tumour risk and extends life expectancy, but is rarely discussed with rat owners. The welfare potential for a well-kept rat is substantially higher than most people realise.