My 13yr old spayed pit bull/choc lab w/ mammary cancer has been keeping us up all night whining every 30 mins to go out. Vet says doesnt appear to be in pain, 1 mass looks to ulcerate at any time, could be Cognitive Brain Dysfunction. She's had 2 shots of Depo Medrol in last 2 months, prednisone every 3rd day, (but off that for 2 weeks, since just had another shot) Proneurozone to help stimulate brain function, and we have an antibiotic to start when the area ulcerates. The episodes at night start at the same time, and have been going on for two weeks. Any thoughts, ideas, advice? I cant determine if I need to put her to sleep.