Owning more than one dog or cat can be fun, but it can also multiply your pet problems. If you have dogs that are fighting over dominance, cats that don't want to share a litter box, or a dog that constantly chases your cat, pet expert Amy Shojai has the answers. From the best ways to introduce a new cat or dog to the resident pet, to dealing with issues of aggression, food disputes, shyness, housebreaking and jealousy, this guide gives concrete instructions for bringing harmony to your pet family.