Domestic cats are another story. Mine actually prefers inside and is not very social even with other cats. Prefers solitude, sleep, cuddles and eating. My dog, on the other hand, a 70lb Husky mix requires a great deal of activity outside as well as socialization with his pack of friends from the dog park. 2+ hours of physical activity and socialization a day keeps him happy but, you have to be a responsible pet owner, listen to your pets and give them everything they need and more. Your pet shouldn't just be surviving, they should be thriving. It's your responsibility.