See, I think if the doggie shower saves her time and headache, it's worth the purchase! A happy wife and all that
I'd probably say our new TV as well, though it's "only" 40". We got it not because we *needed* a new TV, but because we wanted to get new furniture for a room in the house and the TV in that room was a huge glass TV, so we moved the LCD from downstairs up there and got the new LCD.
My wife and I are pretty good and keeping each other from the really bad impulse purchases. And for those other times it's good to have a return policy