I don't have experience in Neos. However my 10 month old RottXMastiff used to do it when he was 4 months old until he was about 6 months old. Anytime he did not want to follow through on a command and I grabbed his collar he would thrash his head around(trying to ger my arm in his mouth) and growl. All I can really say is it was a Tempertantrum exactly as a child would do (apart from biting you).
Here is how I resolved my issue:
I built trust and a bond with my puppy. (playing, training, rewarding, walks)
I mentally exahusted him(Brain stimulation games, puzzle toys, quick training sessions through out the day to work on his look, sit, lay and stay)
When it came to the actual tempertantrum: I WOULD NEVER grab his collar (as I was really setting him up to fail as I knew he would try and bite) instead I would tell him to look (reward). Once I got his attention I would tell him to sit(reward) and once he did that I would put him into a laydown(reward) and tell him to stay. I then would go on with what I was doing or walk away for a bit. only coming back to release him from his stay(reward). All in all it was like a time out but in Puppy form. I still do it to this day when he talks back to me and barks at my lab when he has something he wants. I have not been bitten since and now I can grab his collar. It definately did not go smoothly the first dozen times and took anywhere from 1 min to 10 mins. You just cannot give up until he does as you ask of him.
I myself can always tell when he is not going to obey me he gets this look in his eyes "like really? Naaaah I got better things to do". The "look" command is a savior! and I myself always have treats on me and ready just in case he needs that incentive. He is after all still a puppy.
Hope this helps a little.
