Well, you can't get pneumonia or get sick from being cold HOWEVER I live in Arizona and have tried to bathe the dogs outside when it was too cool and they end up shivering. There's not a lot of humidity here so we only bathe outside when it's hot out. Like 80+ degrees hot out. I like to fault on the side of caution and wash them in the tub and Truman really loves a warm bath - doesn't everyone?
As for the hubby, ask him how much he likes cold baths?