does anybody's dog play with a tennis ball like this??

[poochie:)]

My dog Cleo is OBSESSED with tennis balls! We've never had to buy them for her, she finds them on her own. Anyways, I've never seen a dog do what she does, She'll lie on her back with the ball in her mouth, and then suspend it in the air with her paws. Sometimes this will go on for 30 minutes! does anybody else's dog do this??