obiethedobe

So, Obie is 6 months almost. He is fine with dogs, will try to dominate any dog but isnt always successful. If a dog challenges him he cries and runs away. If no challenge he's a bully and bumps them around but no fights at all.
He is fine with my 5 year old neice,one year old neice, my family. But strangers (adults or kids) he growls and barks.
We were in his puppy class and he was good with other owners and other dogs, one adult guy he decided he didnt like and was growling softly. Another dog owner brought his kids to the class and Obie was watching them and growling again.
I dont understand why he is like that. I realize now that I probably should have started with a female for my first dobe but it's too late now.
And he just got neutered on friday.
Any tips??