Snowball

Snowball is a cute bunny on the outside, but he is the leader of "The Flushed Pets", the animals that were abandoned by humans. Snowball hates humans and pets. Snowball is always willing to help abandoned pets, only so they can help him in his plan. The Flushed Pets' base is in a sewer, there are dogs, cats, alligators, snakes, and more in The Flushed Pets. Max, a Jack Russell Terrier, and Duke, a large mutt, end up in the sewers during their adventures, leading to them to finding The Flushed Pets' base. Snowball tries to convince them to join, but they refuse, causing Snowball to command The Flushed Pets to go after them.