I have a mean to animals baby rex

Question
I have two baby bunnies, a Rex and a mixed breed and I got the rex first, she's only about 10-11 weeks old and was about 9 weeks when I got her and then after a few days of having her I decided she needed a friend and went out and got the mixed breed, also female. The rex seemed to be good with her and groomed her face and ears but in the end she ended up ripping out the fur of the new bunny and gave her sores from it she did it so bad. So it's been a few weeks since I've had them and they've been kept seperate and had romping sessions together and they seem to get along just fine and lie together and groom each other and play and then randomly the Rex will again try to rip out the others fur out. I have looked all over the internet and the only answer I can find is that they need to be fixed but seeing as they are only babies somehow I doubt that's the case seeing as they can only be fixed at 4-6 months. And another point is the Rex does it to our cats as well, and with both cases, when she's ripped the fur out she eats it. And she's definately not nesting with it or anything because I never see the fur again. In fact once I saw her gleefully pounce on a bit of fur she ripped out of the other bunny and then eat it. So why on earth is she doing this? They also both have the awful habit of chewing on the wood of the back door, is that just because they don't have enough toys and enough toys will fix that? Or will I just have to stop them being able to get at it? Thank you for taking the time to read this and answer my questions!

Answer
Hi,

I can't get into a very detailed explanation, but it's got to do with dominance.  When one rabbit mounts another (takes a dominant position) to assert they are in control they often will pull tufts of fur out from the back.  Normally not causing sores, but just the loose fur.  It should look worse than it actually is.  Best thing to do is not try to bond them until after both are fixed and it's been six weeks since the last one was spayed (hormone levels will be a lot lower).  But keep in mind one or both rabbits may not like the other, and one or both may prefer being a solo bunny.  Also you might find they can be together (supervised) for an hour or so each day, but then they need to be separated into their own play and home spaces after that.  Lots of different ways it can turn out.