Hi All- I have a 5 year old white lab who has always been crate aggression, growling, showing his teeth, we got rid of the crates and house trained him.. All was well for a while.. Within this past year he has been increasingly agitated with taking his harness off, feedings, and now it is just all the time. When we go to feed him and we are "moving too slow" he growls, shows his teeth and attempts to bite us. Same with the harness. Our old trainer told us that the fact that he is showing us his teeth first is a good sign because it means that he is warning us and that he doesn't want to bite us. He lunges at people on the side walk if they come too close to us. He is definitely toy aggressive but that has surprisingly been the only thing that has gotten better with him. We have gone through 4 dog walkers in the past 4 months, he is known as an aggressive dog where we board him, we had to fly home from our trip to pick him up from the boarder because he was being so bad. We have been to the vet, they have taken blood work and put him on Melatonin. We have taken him to behaviorists, trainers, the whole 9 yards. It is getting to the point where he is a danger to people and he even attempted to bite me today while taking off his harness. The next step the behaviorist told us was to put him on a sedative which makes me so sad because he is such a happy dog most of the time, loves life, loves going on walks, running and chasing the ball! Is anyone else's lab like this? What did you do to help? Thanks!