My little JRT who is 16 has started to lose weight at an alarming rate. She does not act sick.. Took her to the vet and they ran tests. Her liver enzyme is high but no other abnormalities. She just looks emaciated. She is eating. She is not a picky eater and we are giving her as much as she wants. She has not reduced her intake at all but just looks horrible. She has dropped another pound in the last 3 weeks. She is down from 17 lbs to 12 so you can imagine how pitiful she looks. I'm making eggs for her every day but this does not seem to be helping. She is on a couple of medications but nothing seems to be stemming the loss. Does anyone have any suggestions? She really does not seem to feel bad and looks alert.