My thoughts are that you seemed to have instinctively handled the situation correctly. Joey needed to know that this type of behavior was unacceptable and would not be tolerated by you, the *Top Dog*.

I'm really not familiar with the little breed dogs and their personalities. I understand because of his size you can't overwhelm him with whatever vocal or physical actions you chose to use, but on the other hand, you also need to clearly convey you are the leader and his behavior was not to be repeated.

As far as the pooping goes, I don't know, it may be a bit of a setback in his housetraining due to his perceived stress of having a new sibling with whom to share his mommy and not being able to rid the premises of her. I guess I would just assume that you have to take all the same precaustions you did with him during his housebreaking.

Unfortunately this is where two dogs becomes more than double the work of one dog. It's the work of dog 1 and the work of dog 2 and then the work of dealing with the entity of the two of them together. Be prepared for utilitizing a good bit of patience and spending lots of time as you work toward this adjustment phase. Unless Joey is one to dig in his heels, it should all work out in due time.