Why are dogs and cats the most popular pets?

Monkeys can be unpredictable pets. They can be somewhat aggressive as pets. My state bans the ownership of monkeys.

I think dogs and cats are the most popular pets because they are easy to live with, they are adaptable to living in homes with humans, and they are easy to bond with. You get a lot out of your relationship with a dog or cat. We seem to be able to communicate with them without knowing each other's language. They become family members quite quickly. It isn't all that easy to bond with a fish.