Either this dog has mumps or he thinks he’s a chipmunk!
It looks like he’s got two balls in his mouth – maybe a tennis ball on one side and a ping pong ball on the other doesn’t it?
I’ve known of some dogs that would carry balls like that around most of the day. The ball would just be a gooey mess when they finally let go of it to beg you to throw it for them. Yuck.