[matese]

Poor Lucy, she must feel like an outsider. I would take one of the less aggressive dogs, Love bug or Trouble and put one in with Lucy see how she behaves with just one dog. The 3 original dogs are a pack already and will stick together and defend one another. Reason why try just one dog with Lucy have toys and yourself in that area in case they don't get along, play with the 2 of them, see if you can get them to play with each other. A trainer is a good idea. I had a pack of 3 females,(all now passed) all 3 years apart, they were very sweet and never a growl or nap at each other. I would have been devastated if they had not gotten along, so I know how you must feel. Good luck.