I would feed them seperately - one outside? one in his crate? in a different room... etc...

As for the potty training... That's all I did (the NO! if i caught him, but you can't punish, or say NO if you don't catch them in the act!!!!!) - and even though it seems like it's not working... as long as you are consistant it WILL work. Like, one day I realized , HEY! Smokey hasn't gone potty in the house in days. WOO HOOOOO! Of course, they are puppies and accidents do happen.

Good luck