My very old (16) pit has taking up the habit of constant barking if me or my hubby is not with her or at least very near. She does have hip issues, needing help on the furniture, usually she will slide off herself. I was out cleaning the coop and she barked for 3 hrs nonstop! There were other family in the house(mad) but she wouldn't stop barking or go out. Sometimes she will bark nonstop for no apparent reason us sitting in the same room. She seems mentally stable ,eye sight pretty good hearing ok some leg weakness. Ideas?