i have two rats who are about 11-12 months old now. They are littermates and have lived together all their lives. I adopted them when they were about 6 months old. One of them, Emile, started to get very hormonal and human aggressive so I decided to have him neutered. The procedure went great and he has already become a lot easier to handle and interact with. Emile was always very dominant over his brother, Remi. At the advice of my vet I separated the boys for a week into two different cages so Emile’s wound could heal and he could rest. After a week when I tried to put them back together Remi became very aggressive towards Emile. They are fine in the pet carrier together (no fighting and Emile is dominant) and fine in a neutral space like the bathtub (minimal fighting and Emile is dominant) but in their play area and shared cage Remi has been relentlessly picking on Emile. More than just their normal brother fights with a few squeaks, usually a lot of screaming and I end up breaking it up. I know I could opt to get Remi neutered but he is older and the surgery costs about $250 where I live so I am hesitant. I am wondering if anyone might have any other ideas or advice!!!! I just want them to be happy and able to live together. TIA.