What things make cat or dog a good pet?

In my OPINION, they are good pets because 1) they are easy to domesticate, 2) they can serve purposes like protection from dogs and cats keep rhodents away, and 3) there are no communicable diseases between the species and humans so they wont make each other sick. In my OPINION, they are good pets because 1) they are easy to domesticate, 2) they can serve purposes like protection from dogs and cats keep rhodents away, and 3) there are no communicable diseases between the species and humans so they wont make each other sick.