I have taken Aspen to the dog park, on walks in the "city" and such. He has been great, but it seems recently that he has developed a "fear" of men. He is leery about them until I introduce them. He is doing this with some children as well. He never did it before. Any ideas? He has just turned 5mo. I suppose the idea is to keep taking him out and socializing him. I reduced the socialization during the holidays due to other commitments. I just dont want him to be super fearful. Tomorrow he meets the Shutzhund trainer and I dont want him to be fearful of him.