male dog acting strange

Question
Hi, I got my 6 month old male puppy neutered about 5 or 6 weeks ago. He has started to act very strange lately and I am worried. He often starts nibbling (not exactly biting) uncontrollably, sniffing and then humping the air! I am worried because he seems like he can't control himself! Should I go to the vet or is this natural? Its really freaking me out and I feel so sorry for him because he looks like he can't control himself! Please help :)

Answer
Hello, This is normal and very weird and I've witnessed my jack russell terrier also neutered andis 2 yerars old doing this chattering his teeth after smelling my spayed females butt and he also has humped mid air before not even by the other dogs i own., this is strange but in my experiance normal.