A strong scent is common in unneutered males, and this gets stronger when they age from baby to adult. My first question sounds a bit silly, but I have to ask: can you be sure that he was neutered? Is there documentation, or did you bring him to the vet yourself for this procedure? Many pets are falsely sold as “neutered”, and 3 months is still quite young for a rabbit to be neutered. The reason that I’m asking this is because a neutered rabbit wouldn’t have trouble with raging hormones. The hormones are made in the testicles, and they are removed during the procedure. After the neuter there can be some residual hormones, but those should be out of his system within 6 weeks.

You mentioned hes sniffing another bunnys butt? If you have an unspayed/unneuttered rabbit (or any animal) in the house, it could be causing his hormones to act up despite being neutered himself

The adrenal glands produce a little bit of testosterone in both males and females. I don’t know if that production of testosterone can increase. The strong scent suggests sth hormonal. In humans there are tumors that can produce sex hormones, not necessarily malignant tumors, but they are rare and I don’t know if rabbits can get them.

The sex hormones are of course not the only hormones a bunny produces. In spring, many bunnies, incl de-sexed bunnies, get hormonally aware due to the increase in amount of daylight that reaches the brain via the eye. But that would only apply this time of year if you are in the Southern Hemisphere.

The HRS has a (rather old) article about a super-sexy neutered male, Marshall, who had to be put on chemical castration drugs:
http://rabbit.org/sex-hormones-in-altered-rabbits/

Could he just be growing up? Just because he’s neutered doesn’t mean he won’t go through a “teenage” phase. Is the smell continuous or do you notice it when you “do” something? If my Wooly is POed about something he will open his scent glands and/or spray.

Yes, 7 months old is within the normal range for reaching their teenage phase. It’s more toward the tail end though. Just because he was neutered doesn’t mean he won’t eventually feel rebellious as he approaches “adulthood” at around 1 year of age. Most rabbits experience some sort of behavioral change as they age, some more extreme than others, whether they are already spayed/neutered or not. It’s just the natural process of growing into their adult personality.

Now something could very well be going on in his little bunny mind that makes him feel the need to act territorial. Are his poops coated with a shiny substance too? Those are territorial marking poops if they are. Spraying when displeased about stuff can be linked to that or he could just be moody. Also, the “butt sniffing” could be him leading up to humping. This can also be related because if he is feeling territorial, he could also feel the need to reassert his dominance (assuming he is the boss in the relationship).

So based on what you have described here, I’d say what you’re witnessing is probably just him going through some growing pains. I’d say give him some time. If his glands are clean, then I wouldn’t be concerned in that department. This whole thing may just be something that will pass after awhile.

I agree with LBJ, he will have a teenage phase even if he’s neutered. I’d give it time too. The adrenal gland production of testosterone is normal, I want to stress that. And although it seems that rabbits can get adrenal tumors, that still seems rare.

My bunny Bam had a flare-up of obsessive (really obsessive, he was like a bun possessed) territorial marking a year after he was neutered, so I’ve seen that happen. It died down after a few weeks and it hasn’t returned after that. And he’s been healthy, this flare-up was 3 years ago.

If you don’t see a resolution with this, I would get him checked out. The only other thing I can think of is if he had an undescended testicle, though you would think the vets would have let you know if that was the case.

His anal scent glands are always clean and so is his bum and his pooping is normal. However I still can’t work out where the scent is coming from, or why.

Does the rest of his coat look good?

Hormonal/dominant bunny perhaps.
As LBJ mentioned in her second reply, if you notice some of their regular poos look slightly shiny (as if they’ve been sprayed with oil almost) then these smell. Its the coating that smells. Long term desexed rabbits will still do this as a way of marking territory.