We’ve had an indoor cat (Callista/female) that we adopted out of some kittens that we fostered 7 years ago. About a month ago, we decided to adopt 2 adult cats from a rescue where they were taken from a breeder/hoarding situation of about 60 cats after their owners died, they are around 5-6yrs old (Pursia/male, Daphne/female). The new cats we kept separate for 2 weeks because they were sick with upper respiratory infections & we were treating them with meds. We slowly increased times that our resident cat got peeks of the new ones & started feeding them on separate sides of a baby gate. From there we let the new cats wonder the house while our other cat was asleep. We have let the cats all out in spurts & every single time there is a fight. We thought it would be our resident cat, Callista, as the agressor/protector of her domain but it’s the new ones who are constantly chasing her. Often it seems without provoking as she is trying to avoid or sneak past them. I think the male, Pursia seems to be the most eager to kill her. The other, Daphne has gone after her too though she has a permanent head tilt from a previous bad ear infection so she sleeps or hides more where Pursia likes to lay in the open or wherever we are in the house. These fights are ugly! Screaming, hissing, furballs flying!! It’s horrifying to watch. Callista is afraid to come out anymore when she knows they are out so we have been operating very carefully in shifts. We do still try to feed them wet food twice a day near each other. Please tell me this can/will get better? My husband is ready to return the new cats but I would really like to see this work out. Also to note, the 2 new ones have gotten into a couple fights themselves but it’s not really been an issue like with our resident cat. All cats are neutered. I’m not sure what we’ve gotten ourselves into but it’s all very stressful.