Well, Monty went to the vet. Totally healthy. Only cost 50 bucks. Doctor said I was probably just hearing him sniff things or perhaps he did have a piece of shed near his nose. Glad that I ended up thinking it was nothing before I took him in, so my diagnosis was right. But also glad that, as a new owner, I was cautious and took him in anyway. Turns out Monty is a pretty decent sized boy - 635 grams. Definitely gonna' have to find him a lady-friend before the breeding season is over. Gonna' let him rest up tonight and tomorrow and then feed in on Friday night.