My mom won't listen and feeds them dog Milk Bone type treats all day. I've told her to stop, but she won't. Could be messing with her liver. She threw up lots of yellow bile numerous times.Our very old male heeler is getting mean to our other dog, and they were raised together for the last 7 years. He also pees in his food dish after he eats. He can't hear much, and doesn't see well. I think he has dementia. Do dogs get demented? Maybe that's what's up with yours?