Are you thinking of a Pixiebob (the largest of the hybrid domestic cats)? I have heard some people say they generally do not do well with regular domestic cats, others who are selling them say otherwise. They are very doglike, will follow you around the house, take to the leash easily and even fetch. Bengals, which are probably among the largest "regular" cats, also leash train pretty well, they're highly active and generally not what you'd call a "lap kitty." They loooooove being up high. Both breeds are pretty cool.