We have a rescue Rottweiler from Spain (were in uk) and he's extremely reactive and goes literally crazy on walks barking, lunging, jumping, growling. we thought he was just reactive but he got out of the house the other day when the front door blew open, and bolted to the dog across the road (neighbors) and they didn't do anything until the other dog barked at him. Then he got hold of her, she's only a small dog but she had puncture wounds. now were even more worried about the reactiveness because now we know what he's capable of which we didn't before, we thought he was just 'reactive'. we have tried to train him under the threshold but its really hard to avoid dogs at this point, if we come into contact with a dog I especially cant control him because he's so big. Tried pulling up on the lead to stop him reactive but that doesn't work either. really struggling with this big boy now. He is around 1-2 years old. This is him with my parents dog, who he can walk next to on walks but he also went for him one time when he growled at him. He goes out on a dog walk with a professional dog walker and about half a dozen other dogs, these dogs dont start wi=th him so he hasn't physically done anything to them, but he is a big bully, he tries to push other dogs around, dominate them, pin them down etc. especially submissive dogs.