Hi Sully&Dino
Welcome to the forum.
It sounds as if you’ve done some reading up on introductions/bonding, with the cage swapping and bathtub intros. However, one of the key steps is to have both rabbits desexed first. Since Dino is only a month away from having this done, I suggest halting any further bonding work. I would give him another month post-neuter before commencing, myself. Currently, the interactions will be increasingly influenced by his hormones. They’ll be coming in any tick if the clock now, if not already!
It can cause set backs and impact the future bond.
An adult and baby can show some good interactions but it is challenged when the younger reaches puberty. Same is true of baby rabbits together. Had his sister survived, chances are they would have to have been separated by now or in the next month, due to hormones. Especially since they were M/F.
Having Sully and Dino’s habitats side by side will provide both some companionship.
As of late, they’ll get up close to each other and kind of smoosh the lateral side of heads together and we pet them to try and keep them from nipping at each other. Eventually one gets fed up and tries to nip so we separate them. Just curious what that is all about?
Lol! If they’re lowering they’re heads, this would be what is known as “groom wars”. Both are requesting to be groomed by the other. So it becomes a sort of stand off. OR, they could each be vying for your attention.
When I had a young pair of boys I introduced, they would do this. I could have both on my lap and pat their heads simultaneously, but the moment I stopped, one would sneak his head around and try nip the other. He was definitely the more dominate of the 2. However, the other, on his own on my lap (he was really a lap bunny) would give me a little nip when ever I stopped patting him. They use light nips to communicate.
I’d be interested to read others opinions on what exactly is going on in those moments. Is it Sully that eventually nips Dino?