Hi, I think your dog has socialization issues. You can address this specific issue by getting him used to being around other people and animals.
You should take him out for a walk to introduce him to other people beyond the confines of your home.
However, he should first undergo proper leash training so that he can be easily managed outdoors. For instance, the recall command is necessary in case he goes off-leash to prevent any untoward incidents.
I think I have read about the same problem in Daniel Steven's book.
Just in case you are interested to purchase it, make sure to check out the review first:
http://www.dogobedienceadvice.com/si...tch-review.php
I hope this helps. Cheers!
