I still don't see why pets can't just have normal human traits that are available from birth-childhood. Pets can be inappropriate, but in their pet ways. I mean the cat should just have the Inappropriate trait as an option, and have the unlocked interaction to offend his pet parents by climbing on the kitchen table and making himself at home by grooming himself or napping on it, or trying to jump up on the kitchen table when the pet parent is trying to eat. Or perhaps wake their owner up in the middle of the night to want attention. Or a mean-spirited dog can randomly attack humans and get territorial and make enemies with other dogs.