We have a rule in this house that the kids must not open the front door as the dog will bolt out. Dd2 just opened the front door, the dog got out and ran after a dog of the same breed, the lady walking the dog kept running further away from me, and I had to shout at her to stop running, so I could catch my dog, but my dog then bit her dog on the back not a big bit, didn;t break the skin but sort of grab the skin IYKWIM I just don't know if I can trust him now... We know he doesn't like other dogs and we dont have other dogs here for that reason, he is fine with our cats and us..