I don't use one for the main reason being that I can wash the dogs for free at the training centre. If it wasn't for that I would probably use one just because I hate having to clean the bathroom after washing the dogs (didn't mind it so much when it was my sisters bathroom and didn't have to use tub and stuff afterwards) that and with all three of my dogs not liking water, it's a pain in the butt trying to make sure that I get all sides with the wall being in the way.

In other words I think it's a great idea Amy.