I need your suggestions to help me to get my yorkies to play. I would like to buy them the kongs but I don't know what I can put inside that would not upset their digestive systems. They are pretty sensitive to things outside quality dog food, apples and carrots. I did not have them since they were puppies so they came with their own habbits, if you know what I mean. Sometimes Mimi will play with a sock tied in a knot but not very often.
Can anyone help???