I had two dogs growing up.  They were brother and sister.  About once a year for the first 7-10 years they would get into a knock down drag out.  I mean blood and puncture wounds.  Granted they were big dogs, but the vet said this was common.  Our dogs never fought when we weren't around.  I think it may have been a jealousy issue.  It was hard to seperate them at first, but after we did, you could tell they were sorry and they always licked eachothers wounds.  I would talk to your vet.  I am sure Bailey is just a little jealous considering she use to have you all to herself.  Good luck.  I am sure that they will adjust.     
				__________________  Shannon, Lola Larue, Chewbacca Joseph(aka Chewy)     |