Is it safe to assume he's not aggressive with the other dogs in your home? He's 4 and you had him for 2 years. Where was he the first two years then? Also, your post seems to only mention men that he's been aggressive with, were there any females?
Something must've triggered him to get more aggressive like that... Maybe you should seek a professional? Your neighbor sounded really angry... I hope things work out for you and the little one. |