Our yard isn't fenced in so when the boys go out Woof goes on his chain as he's a runner and Boone is allowed to free roam as he's always stayed on the property except for the occasional trip to the house next door when the neighbor or his dog is outside which wasn't a problem. We've been here for 5 or so months now and he's never done this and now in the past couple of weeks its become a problem. He chased two senior ladies down the road that had been walking past the house and then chased our neighbor's son all the way down their drive way right to their front door. The poor kid is now scared to death of Boone and understandably is not happy and also made us aware that not too long ago Boone wouldn't let his wife get out of her car. So now Boone gets put on a chain as well if someone isn't outside to supervise which while not the best option right now is the only one and the safeset one. Nothing's changed that I'm aware of to make him suddenly start chasing people. The boy hasn't done anything harmful to either dog, he's a very sweet kid though Boone has a strong dislike of children anyways he has never openly chased them just usually growls and tries to avoid them. He did have severe fear aggression but I've worked with him since day one of adopting him and now its mild to almost non exsistant or so I thought anyways. He's a different dog then when I first adopted him people don't believe me when I tell them he has fear issues and is very high anxiety. His anxiety is another issue... I hate leashing or tying him up, his anxiety goes through the roof and he just goes in circles non stop until you let him off. He'll do it all day every day, I've seen him stumbling like he's drunk he's so tired but just won't stop. So him being on a chain is not the best option either but neither is fencing in our property. Any ideas what might have caused this sudden chasing? Fine for months loose and now all of a sudden he's a hell hound to anyone walking near the house. He won't try it if I'm outside with him, but he will if I'm not around or inside even if someone else is outside with him. I hate to chain him up and see him so high strung but I don't want to get in trouble with the town and have Boone get in serious trouble.