Oh, let me tell you about "jealousy pee-ing"! When we got Guinness, it completely undid Bailey's housetraining for a while.

The first week we had him, she peed up to 6 times a day in our apartment! (Did vet check, no urinary problems) Many times it was right in front of him, his crate, or the food dishes. She was SOOOOOO jealous. One morning, she peed in front of his crate, and then while my husband rushed over to clean it up, she ran into the kitchen and filled up Guinness' food dish with pee!

It took a while to re-train her on the housebreaking and make her understand that we were not replacing her, just adding to the family. She finally got over it,she's completely housebroken now, and she seems happy she has a brother. (See signature picture below)