bad rabbit, but why?

Question
Dear Miss Sharp,

About 2 months ago I bought a lionhead rabbit. We bought him through the L.A. County fair which I feel was a mistake because they did not know his age, sex, background, or if he was neutered or not. But that's besides the point.

As it turns out, he was around 3 - 6 months old and not neutered. So, we got him neutered within a week of having him. Which brings me to my problem.

Previous to his surgery, Darwin was very sweet. Though he was adventurous and liked to test his limits, he was very sweet. He gave tons of kisses, liked to cuddle, would run to the side of the cage to greet us and was generally good mannered. He never showed any signs of being aggresive.

However, about a week after his surgery he grew visibly nervous and shy. He would run from us, wouldn't greet us, and hid. About two weeks after that began he started biting, charging, grunting, and thumping his back feet.

I'm terribly perplexed by all of this as he had a two story 'bunny abode', plenty of toys, fresh timothy and water, fresh veggies, the occasional slice of fruit, and I try to give him at least an hour outside of his cage to roam and such.

So my question is, what did I do to make my bunny go from such a sweetheart to a bad tempered animal, and what can I do to change it?

Thanks,

Bree

Answer
He is the perfect example of what can sometimes happen to a bunny when getting altered.
Sorry to say, but 75% of the rabbits I have encountered that have been fixed always had a change in attitude. Usually males do go toward the worse. I don't neuter or spay my rabbits for this reason.
I am not sure that there is anything that you can do to change it, other than constantly exposing him to positives and never negitive situations. Keep working with him and hopefully things will get better.