You shouldn’t anthropomorphize animal behavior by misinterpreting their instincts for human emotions. Feral and tame cats of all kinds will play with their food to hone hunting skills. Dogs will ravage and eviscerate other animals as play. Hamsters will eat their offspring under circumstances where it would mean the parent has a better chance to survive without them.

Cats do not “love seeing things in pain” for the same reason that dogs don’t “love” seeing a toy rabbit torn to shreds: both behaviors rooted in their hunting instincts. True sadism (hurting or killing another being for no reason other than pleasure) has only been observed in animal groups that also possess higher-ordered cognitive and social traits, such as cetaceans and apes.