Some rabbits are known to do that.  Can you let him get out of the cage b4 you feed and water him?  That will help as should the neutering too. They get real picky about their sanctuary sometimes.

Or you could try penning his shoulders/head down to the floor when he does it.  Holding him down for a little bit.  It might help.  Or it might make him angrier.  Won’t know til you try it. 

Though I would prefer letting him leave his house b4 you tend to his needs. Depends on the rabbit what works.

welcome here! you are right that neutering may help this behavior, but this is something you can begin to work on now…

here is the House Rabbit Society’s FAQ on Aggression. http://www.rabbit.org/faq/sections/aggression.html

it’s very important that you are confident and do not allow this aggression to affect the way you are around him. if he realizes that he can get what he wants by nipping, that will become his form of communication. BunnyTowne had great advice when she said to hold his head down for 5-10 seconds. this will establish you as the “top bun”. even if you need to wear an oven mitt or glove at first. just make sure to rub it on you so it has your scent.  if he does nip you, let out a high-pitched “EEEEK!!!”  he will pick up on your displeasure moreso than if you just jerk your hand away…

rabbits seem to be more territorial over smaller areas. if he is in a small petstore cage, you might want to consider upgrading to a NIC grid condo or a dog exercise pen soon. this is beneficial for him as he will have more space to play when he needs to be confined at night or when you are at school/work. and he won’t be as likely to defend a larger area.

another great article, this one from House Rabbit Network… http://www.rabbitnetwork.org/articles/agressive.shtml

^i’m not sure, what does your vet say? is it b/c he is too small, is it b/c they have a policy of not doing it before a certain age? usually once the testes drop, they can neuter. this happens betw/ 3.5-4 months on average, your guy might just be an early-bloomer… i’d follow up with your vet on this topic.

They may want to wait as well to ensure the rest of the organs are fully developed…Having under developed lungs/heart/kidney or liver could spell disaster. I’m sure that’s why a vet would want to wait even if the testicles have descended, but as Beka said I’m sure your vet would welcome the question and be able to answer better then myself!

On the aggression you could either avoid situations where he’s aggressive, let him come out of the cage himself and keep him away when you have to go in there to clean or fill food/water. Or you can try dominating him (by pushing his head down) and yelling when he bites.

I’ve had several rabbits box/charge/growl when I’ve opened their cage to get them out at one of the shelters where I volunteer. I start by putting my fist close to the door of the cage, on the ground low… and as they cower in the back i move it slowly towards them. If they don’t box, I then give them nose pets and take them out.
If they are aggressive again, I cup my hand slightly higher then it would be on the floor of the cage (cupped like you would catch water with it, about two inches off the cage floor). They interpret this as an offer/asking to give them nose rubs, and then lower their chin to the ground (ceasing all boxing/growling/attacking behavior) and I give them nose pets. Then I scoop them out of the cage no problem.

^^^i have started doing the cupped hand thing with my two bunnies. it works! they do interpret it as a sign for grooming… i do it with Max (my shy bunny) and he will come up and nose bump my hand.

Honestly some animals cannot be free fed as they will eat until they explode -or get obese or sick.

How old is your bunny?

My buns all free feed. Two of them I don’t know how they were fed before but I found just always having a full bowl of food (well there are three in different spots of the house) they settled into just eating what they needed right away. They don’t overeat and eat a lot of hay so that works for me. Some rabbits like I said just can’t do it.

You could certainly try free-feeding. See if maybe he feels full so he’ll be less grouchy? One thing I do is never let the bowl get empty -I find they eat more when you fill it up after it’s empty. Just keep it full, filling it several times a day if necessary. If after a couple of days he’s still eating alot you may have to go back to rationing the food.

Oh yi he is doing it in the xpen now?  HE is a very determined little bunny.  Yikes. Yeah I think gloves would help oven mits or something. As someone previously suggested (I forget names too easily these days)  rub it on you or your bedsheets to get it to smell like you.    He can bite that thinking he is biting you and you won’t react cause hopefully you won’t  get bit as hard with that oven mit on he may stop after a bit.

If I pen Cotton down once I let him back up he comes at me again so it doesn’t work on him.  I learned not to pet other buns from the pet store so I dont’ get bit no more hehehe.

There is a story in houserabbitsociety about aggressive buns. Maybe you can find it.  It may help.  I believe that person used a big soft glove too and her bun eventually stopped and became real friendly with her.   It might give you some ideas there.

Yeah found it.   Go to that site   choose behavior     then when the page comes up scroll down some and there will be Aggression and age related behavior.  Maybe something there can give you ideas.

Dang I can’t get it to copy and come here so you gotta go find it.  Only thing I can do it email it but no copy or paste   oen day I will figure that one out.