We have a 5 year old heading dog that is my husband's mainstay, he's used to being out all day herding sheep and cattle. He injured his leg a few weeks ago and we're supposed to be keeping him as calm and still as possible for 2 months. He's going out of his tree with boredom though, he just howls and howls. I've made a tube with some treats in it that he has to roll around and figure out how to get them out. That kept him occupied for a bit, but he's bored of that now. He doesn't really know how to play, he just wants to work or be patted constantly. Does anyone have any ideas for how to entertain him and keep his mind occupied while he can't be running around working?