Woops, this does sound like an early-onset puberty. Is he a dwarf or dwarf mix by any chance? They tend to mature faster than larger breeds.
Litter box training is going to be difficult as long as his hormones are still up and running, but I’ve already seen that you’re doing everything as adviced. I’d take him to the vet to get him assessed for neutering.
Do you have a rabbit-savvy vet around to neuter him? One way to find one is to look at our Vet Resources topic: https://binkybunny.com/FORUM/tabid/54/aft/116849/afnp/276220/Default.aspx
A good vet has exotic animal experience, regularly does neuters AND spays, and gives your rabbit a proper check-up before doing any surgery.
How to spot a bad vet: any vet which advises you to bring in a rabbit sober before surgery should keep his/her hands off your bunny. If a vet or vet tech comes up with this; run! Humans, dogs and cats have to go under sober because we can vomit and choke on it during anaesthesia. A rabbit physically can’t vomit, and fasting will likely cause them digestive upset. They’re also going to need the energy to recover quickly.
Rabbits make a lot of different noises which can be just at the edge of hearing. The meanings can vary from rabbit to rabbit and some rabbits will become more or less vocal over the course of their life. Breintje has become very vocal since he’s been living with me, he has learned to communicate many of his wants and needs. This is what we could distinguish from our Breintje so far:
– Purring: soft tooth clicking when we pet him. Oh yes!
– Moping: soft grunts in a row, sounds like someone exhaling from a blocked nose. “Njeh! Njuh Njuh Njuh!” Too cute ^_^ He does this when he’s a bit impatient: when we’re late getting him his dinner or he’s been waiting to get out of his hutch for ages.
– Honking: when he still had all his gentleman bits and was making advances towards every object within reach. I lost many balls of fine knitting yarn those weeks…Yuck! In exchange we made the vet take his
– Loud grunt: Hrrrmpf! You’ll know immediately that this is one p-ed off rabbit. He rarely makes this sound, except right before he attacks something. Something like the vacuum cleaner or other things which startle him. A friend of mine was hugging him on the floor and she was wearing a bandana. It slid out of her hair and fell on Breintjes nose. He jumped up, grunted loudly and attacked it.
– Thumping softly: Tap! with the front of his foot. Wanting attention, no chance you’re going to ignore me, I’ll continue to tap-tap-tap at you until I get my cuddles. He does this when he thinks it’s cuddle time. He’ll sit on the couch next to my spot, and he’ll stare at me and tap! until I come over. Well-trained eh?
– Thumping loudly: TAP! with whole foot. Extreme excitement, extreme anger or extreme fright.