If a rabbit is not neutered and you get another rabbit of the opposite sex will they fight?

They might fight, but it's more likely they will mate and have babies. Please think twice before allowing rabbits to breed. There are bunnies all over that are living in shelters and waiting to be adopted; many will even be killed by the shelter because no one has adopted them and their time has run out. If you want to be involved with more rabbits, contact a local shelter, rabbit rescue group, or House Rabbit Society chapter.