If it`s a serious problem on the street, you can take your roommate to civil court. The pet contract is usually “added” by an amendment or modification to an existing rental agreement and is part of the initial legally binding contract between the lessor and the tenant. Your roommate`s pet will somehow be your responsibility. If you really don`t want to deal with a dog, move in with a roommate who has the same meaning. Solid colocation contracts contain three main sections: basic information about roommates and real estate, considerations of a legal or contractual nature, and basic rules of conduct. If you feel that the dog is neglected, you have a much more serious problem on your hands. You can start by playing your part in helping the dog. Tell your roommate what you noticed.