I have a 14 year old mutt and she is gotten so strange with her habits and her diet in the last few months that I feel like I'm going crazy. She alternately won't eat, then over eats, yet still has gotten so thin. She has arthritis and she's occasionally incontinent. I took her to the vet and the meds he perscribed seemed to make her even worse, more lethergic and weak. I gave her a hotdog the other day out of desperation and she loved it. Now I don't know how to keep her healthy if all she will eat is hotdogs. I did try just leaving her food and thought she would eat when she was hungry, but she won't. She went a day and a half without touching her food before I broke down. I know I can't afford to let her lose any more weight. What's the best course of action?