Tornjak Dogs

[Southern by choice]

Grazers recommendations are exactly what I would be posting.

I just read about the socks. PLEASE do not give your boy socks or any kind of cloth to chew/play with. I have seen toooo many surgeries on dogs that had to have their intestines cut open as it was blocked... "SOCK" almost everytime.
One Golden had an obsession the people did try to prevent this but after her 3rd surgery for this and part of the bowel being removed the vet told them IF it happens again I will be keeping your dog... as it would be better to live in an animal hospital than die of a sock. He wasn't mean to the client at all but simply said the dog couldn't take another surgery. Undo this one quick.
Playtime should be occurring OUTside of livestock areas, continue with obedience like you are.

Raw bones (I like deer) are great for him.... never give cooked bones as they can splinter and punture his gut.

What kind of collar are you using?

 

[she-earl]

He just has his normal collar. The one that has his tags on it.

 

[Grazer]

Bully sticks are basically dried pizzles. They are easier to digest than rawhides and are usually free from preservatives and harmful chemicals.
It takes puppies a while to chew them down, especially the jumbo ones (adults are another story lol, it takes our dogs only 30 minutes to completely finish off a bully stick that's 30'' long).
The only downside to bully sticks is their price. They are quite pricey.
The cheapest I can ever find them is online on amazon.com, 2 lbs of Cadet bully sticks goes for around $38

So raw bones may be a better option.
And I forgot to point out in this thread (I did in another one with a similar issue) that playtime should always occur away from any livestock & poultry, as Southern suggested.
Then hopefully soon Nanuq will start to realize that being around farm animals means he has to be calm, and that he can drain his energy in the designated area's with his owners and the other dog.
You can also do some basic obedience training with him + teach him to allow you to check his ears, teeth etc. That will also keep him occupied.
A tired dog is a good dog they say lol

I'm glad to hear Nanuq won't be neutered too early.
A lot of animal health care experts have been saying that early neutering/sterilization can cause some serious health problems in dogs, especially large breeds (bone cancer, abnormal Bone Growth, hip dysplasia etc)