Our Sheltie puppy loves his peanut butter Kong treats, which he gets every few days (one a week perhaps less) but because peanut butter is high in fats, sugars etc, we don't want him to get chubby as his breed is prone to easily becoming overweight, however peanut butter keeps him occupied for a good half hour - hour.
He has two Kongs, one is a pink large breed puppy Kong gifted to us by a friend whose dog outgrew it, and the other is a blue small breed puppy Kong. The blue one gets his peanut butter in, the other sometimes gets his regular food in, dinner or breakfast, but he'll often get bored of this. He also refuses to eat his kibble mushy, we've tried this in his Kong too.
I know you can purchase the official Kong fillings (but these are rather expensive) so I was wondering if anyone had had decent sucess with other various Kong fillings?