I head off to work in the morning and leave both my boys in the dog run for the day. I have heard that you should leave toys and other objects with your dogs to keep them mentally stimulated throughout the day. I have a molecube and a Bustercube for both of them. What do you do with your dogs to keep them stimulated throughout the day? How do you maintain their interest in the same ol toy, should I be switching it up daily? Please comment...