Hi there sheltie lovers. I have a soon to be 16 year old sheltie. For his age he is healthy. Still gets around, runs around the back yard, has a good appetite. He does have some kidney failure beginning but my concern is that he has started going to the door, he rings the bells to go out. I carry him down the deck steps, he wanders a minute and makes his way back to the door to come back in. The problem is that he circles the den for a few seconds and rings the bells again as if he hasn't been out. He does this over and over and over. Really only in the afternoon. It's just unusual behavior. Could he have some sort of dementia?