If you could train your dog to do housework, what one task would you make him/her do?

i would get them (i have to take care of 4!) to feed and water themselves and also get them smart enough to not tangle themselves up in their chains!!! (my dogs arent allowed in the house...theyre all kelpie x's!!!) and if theyre smart enough not to tangle themselves up, maybe they would be smart enough to train themselves, too!!!