Okay. Sunni did this, and now so is Sophie. I find it so strange that I have to ask if anyone understands.
There is a water bowl next to the cat's food in the kitchen, which always has fresh (bottled) water in it. I'm giving Sophie bottled water because we are on a well and she's just a baby. Yet, every time the kitchen door is opened, she darts out onto the interior back porch to the dog's water bowl and drinks like crazy! I have seen her drink her own water, too. Sometimes I think she's doing it just to drive the dog nuts!
Any ideas? Oh, and the dog gets the well water, always has. Thanks!