There is a tennis ball floating around, it gives you hints at the top of the page sometimes to help you find it. For example "The first letter of the dog who has it is "L". If you find it, you get to give it to one of your dogs.
The bone board is also a game. Sometimes when you are on a topic, at the top there is a box, that tells you once you start you can't move your mouse outside the box or you lose. It will then show you a picture of a dog, and will ask you either which member it belongs to, or which breed it is. If you guess correct, you get a bone, if you guess wrong (I believe) you lose a bone.