Both. We have two of each. Used to have 4 cats, but had to put two of them down, and have had 2 other dogs before these two. The cats each had very distinct personalities, as do the dogs. We sadly suspect that it won't be long before we have to put down one of the dogs - Bo, who is almost 11, starting to lose his sight and mobility - and one of the cats - Misty, who has thyroid issues, no body fat left at all, and isn't grooming herself that well any longer. She's going to be 15 in July.