Ruthie is like that too. She won't play on her own except chewing on her bone. One thing I thought about getting is something my sister used with her pot-belly pig. It's a ball and you stick food/treats in it, it has little holes but they have to roll it around to get the treats out and it takes a while for the treats to come out so you aren't really over feeding. Her pig played with that ball for hours and wore the pig out. Ruthie loves balls, but pops them quickly and this thing is hard plastic. Maybe check into one of those?