Oakley, our German Shepherd, is fine with baths. If he's already near the bathroom and you tell him "get in the tub" he gets in himself.
However, he's started something new and ridiculous. If we're not near the bathroom and ask him "wanna take a bath?" he starts going nuts. He runs, barks, and tries to climb into my lap. He'll do it over and over again.
Outside, he's a hose hog. He loves it when you spray it full-force and he'll gobble it straight until he almost horks.