Can anyone recommend a good behavioralist/trainer in the South Boston area that won't cost me my children's college fund? My 3 yr old yorkie has developed extreme leash aggression. I have tried positive reinforcement with treats on our walks, a spray collar, different harnesses. She is fine in daycare and off-leash dog parks. I'm exausted and need to resolve this as we live in the city so we don't have a private yard for her to run around in and dog's are everywhere here.