My 10 year old therapy dog, Tali, who has visited the hospital on a weekly basis for the past 7+ years, has suddenly developed an aversion to working there. She has always been amazing -- full of love, super gentle and also pretty good at tricks. Tali has even been featured on a couple of cable TV shows and has gotten awards. Now she shows a lot of stress when we visit, won't do any tricks, is disinterested in treats and just wants to leave. I can't pinpoint anything that may have happened to explain this new behavior. She is absolutely fine everywhere else. We took a few weeks off, but this has not helped. Today I tried taking her to a different unit in a building several blocks away from the main hospital, but again she was stressed and unhappy. Yet, when we visited the volunteer office across from the hospital, she behaved normally. Tali has given so much of herself over the years that I am beginning to wonder if it's possible she's gotten burned out from working with hospital patients. Has anyone ever heard of something like this? Any other thoughts?