As in all animals species there are time to time "bad blood genes" I raised and showed rabbits for 9 years. In that time I did see about 5-6 bunnies that were just mean. some to the point of killing ever litter they had. I found the Dutch and Netherlands were the most likely to be aggressive. Over bred just as many dog breeds are. I'm glad Roxy is being given a chance in a new home and that a new bunny was there for you. Teddy is so cute.