I absolutely love these balls, when my corgis see them they go nuts knowing it's play time. I still gave this a 5 Star rating as I thought I'd give the medium balls a try instead of reordering the smaller ones. Big mistake. For a smaller dog like a corgi, when they would paw on the ball they would hold it down just making the velcro impossible to release the treat in side. I gave them to a friend with a lab. The smaller balls are definitely the size for a corgi. I'm hoping the velcro lasts longer then before.