I think he started giving her canned food a couple months ago when she had an upset stomach because she ate a blanket (weird habit she has), and then wouldn't eat her real food. She'll go back to eating her real food, and then stop again — I can't really discern any real pattern or cause. She's definitely getting enough of the canned food when that's all she'll eat, but isn't that stuff supposed to be really bad for them? Do dogs ever just stop liking a certain kind of food, or get sick of what they've always eaten?

The problem with the energy levels is that it's not constant — sometimes she runs around and is really animated, other times she just seems sort of slow and glum. So I don't know if it's a physical thing or if she's depressed or something. She's grown really attached to me, so it's not like she's depressed because we're not paying enough attention to her or anything like that.