Teaching your dog to fetch is a wonderful activity. A dog that retrieves tends to get more exercise than a dog that doesn't. With a retriever, it's easy for you to just stand in one spot and throw a ball for your dog. A lot of dogs like to chase after the ball and bring it towards the owner. When the dog gets close enough he/she starts to play keep away. You can get your dog to give you the ball by having two tennis balls with you.