The FitPAWS Mini Egg is a conditioning tool used to develop core, rear and shoulder strength for dogs. It is perfectly sized for toy breeds. At maximum inflation, the Mini Egg is 14"L and 7"H. Toy breeds and small puppies can also strengthen their core muscles by working on top of the Mini Egg with their owner's assistance in stabilizing the ball. Because the Mini Egg is an inflatable object, your little dog will have to engage its core muscles in order to stay balanced on top. Easily inflates with a FitBALL air pump (sold separately).