Well, just returned from the Emergency Vets. Mella developed quite a limp in her right foreleg. I think Trace was behind it, as her behind is often in motion. The X-rays showed no bone problems, and she wouldn't yelp when the vet was feeling her leg. So we really don't have a clue as to what's wrong with her. She's currently throwing a fit that she's been confined to the crate. Hope she'll be better soon.