This is the reply from a farm boy point of view.. having raised many different animals in my lifetime I have to say that you can "always" see the difference between neutered and not.. There is just a muscular natural beauty that seems to attach to all "natural" males.
I feed my dog the wolf diet of raw meat and think that nature and God had it figured out pretty well before the dog food companies and humans got involved.
I won't be cutting Thor ever, unless he starts running off and I can't control it (and even then it will be a last resort).
As for spaying...Well, wasn't much use for that on the ranch

What could be better than a large slavering monster that follows you everywhere and wants to lick you to death?