So /an/, I need some help.

My roommate and I have two dogs. Two rat terrier, jack russell mixes. One is older, around one year I believe. The other is very young, barely three months. The older dog was very well house trained. She would go to the door when she needed, and never went in the house.

Things changed though once we got the puppy. Now, not only do we have to clean up the puppy's messes, we have to clean the older dog's as well.

What gives, and what can we do?