We're taking care of a stray cat (have been for 4yrs now). Today we noticed more so than before...that it looks like she's not digesting food...it's sort of passing through. She's gotten sort of thin. Scarfs down canned cat food normally. A short while ago tho..she's not even tried with cooked chicken. Normally she's trying to take it out of the frying pan (done that once already actually.) Is she developing terminal problems?