Hello Forum! I usually never turn in forums on the internet, but I came across this forum, and thought it was worth a shot. I’m desperate for help.
My bunny, The Nibbler, is growing increasingly vicious. He is a light brown dwarf rabbit about 1 years old now. We got him when he was a baby, and he was neutered when he was about 5 months old. He loved us so much when he was small, and would hop up on my lap to get petted and he’d actually bunny-flop in my lap. He actually started to get more vicious when we brought him home from the vet. Reading around on forums, I thought he would get better over time, but in fact he’s getting worse.
We let him out of his room to run around the house everyday (He has his own bunny-proofed room and an open cage) for about an hour and half. He used to run around and play very friendly (Licking my feet and I’d pet him). Now he just poops all over the house and tries to bite my feet when I get close to the carpet or sofa (Which he’s taken over.)
He still likes being petted, but its really strange that if you pet him the right way, he’ll purr, but if you pet him a way he doesn’t feel like being petted he’ll actually bite and lunge. He bites hard enough to leave marks and draw blood. I have to wear thick “armor” whenever I let him out now. I miss my little bunny that didn’t poop all over and happily played around the house. He’s litter trained in his room, and pees in his litter box when we let him out, but he poops all over and chases us off any furniture and carpet now. I don’t know how I can fix him. 
He totally refuses to be picked up. And will take treats from my hand and then run away after he’s eaten them. His mood will change so quickly. One min. he’ll bunny-flop on the carpet and I’ll pet him for half an hour (Him purring all the while). The next minute he’ll attack and drive me away.
Please help me .. my arms have scars from so many bite marks, and feet too. I love my bunny so much.