My 7 mth old americanbull dog bordercollie mix reacts with barking and growling whenever pur next door neighbors get home. I work from home so I usally run down and tell him to quiet down. He will hid under the dining rokm table and today, I attmepted to pull him out. He then flipped out on me and snarled abd snapped at my hand as I went to get his collar and broke the skin in one spot. This is the 2nd time he has reacted this way and the1st time was with my boyfriend. We have contacted an animal behaviorist but she wont be out for a couple wks. I am so uset.. My othet dog was completely different than this one. This one seems to have an overly protective drive as well as no gentleness. I don't want to give up on him; but he has never reacted this way to me before. I am terrified he will do it to friends or family members.