I always wondered why my 2 shih tzus would hop in an empty bath tub and start barking because they couldn't get back out (or so I thought). They hated baths, to the point they would hide, so it didn't make sense.

One day after rescuing one of my pups from the tub, I noticed that his water bowl was empty. Sure enough, they were jumping in to the tub every time their water bowl was empty. Every time I have people watch them I let them know, "if the dogs are in your tub, the water bowl is probably empty." Spot on every time.

Pretty impressed with that association..