Out in his garden, Donald builds a huge dog bath machine with loads of pulleys and scrubs. Why he would want to subject Pluto to this behemoth instead of washing him normally I don't know but it's obviously Pluto ain't gonna be up for this.
The dog himself is snoozing in his nearby kennel and Donald must trick him into going into the bath with a rubber bone on a string and then a puppet of a kitten. Pluto doesn't fall for it and the highly expected ending of Donald falling into it proves true. Only he's too happy that his craftsmanship has actually worked to be annoying.
It's not that funny but the vivid and inventive animation makes up for it.