Hello! Let me start from the beginning I have two bunnies both different breeds. The first one that was brought to household was Claire, a lion head. She was brought as a baby bun and took claim over her territory right away when her sister Cleo, a Holland lop, was introduced to her a few days later. Their friendship started with aggression, Claire targeting Cleo, but soon let to them being the best of cuddle buddies. They have spend the last 3 months with a giant pen to constantly roam, cuddle, eat, and sleep. Since their first meeting there has been almost zero signs of aggression towards the bun buns. Unfortunately this morning we woke up to Cleo with two bite/cut marks on her ear, blood spots on the floor, and Claire’s fur everywhere . We don’t know whether there could be a possible rat attack because we have seen little evidences of a possible rat in the area they roam, or if the rabbits suddenly turned on each other. We brought them out of their pen to be observed and they were cuddling and being their usual selves until Claire, the obvious, alpha started to chase Cleo around. They are currently separated as seen in the phot but do have moments when they try to reach each other. Should I be worried that their relationship could become aggressive? Should I keep them separate or is this something that is “normal”? We believe my buns are both girls and around around 3-4 months. Neither are spayed.