Max, Sam, Riley and the pet sitter

When I opened the door to let Sam & Riley out, Max came out too.  I was surprised to see him in there with the dogs.  He had been in the bathroom during our morning visit.  He was drinking water from their bowl.  (His bowl upstairs had water in it.... I checked to make certain.)  I guess the dog's water tastes better.   I made certain when I left that he wasn't in there!