This small size is perfect for my 3 year old. He can pick up and throw the ball easily with this without hurling it over the neighbor's fence or whacking himself, his baby sister, or the dog with it in the process. I was worried that the medium sized balls might be a bit on the small size for our Lab but he doesn't seem to have any trouble with them. What could be better than a Labrador and a toddler that are too happy and tired to get in to trouble?