Cats are obligate carnivores with strong predatory drives. Indoor cats need environmental enrichment that gives these drives appropriate outlets to maintain psychological wellbeing.
An unstimulated indoor cat is not a content cat — it is a bored one whose natural drives find no outlet. Play-chasing, stalking, pouncing, and catching are not optional extras but core behavioral needs. Cats denied these opportunities may redirect onto owners (play aggression), become obese, or develop anxiety behaviors. Environmental enrichment is genuine welfare provision.