Ok, that's a sensationalist title and not fair. Although Mariah does in fact bathe with her pooch it's just very sweet.

If I'm running a bath all of a sudden I'll hear a splash and Jack will have jumped into the tub. It's something that has been happening for ages - it's like, 'It's like Jack is in the tub again, swimming around...His favourite toy is a jet - like the ones you find in pools and hot-tubs. He continually dives under the water and tries to bite the water coming out of the jets.