Sw...itched

After a typically traumatic bath time, Dad decides to take a leaf out of Walter's book and lures Gnasher into Claude the cat's luxury pampering tub. But, horror of horrors, sharing the bath has a strange effect on the two pets, as they seem to switch personalities...what's going on? More importantly, how do Dennis and Walter get their furry friends back to their usual scruffy and sleek selves?