First of all, sorry this is so long! I have three Tollers, and my youngest is 2 and he's called Teddy. He is quite hyperactive, he never settles and is very excitable. He has been in obedience classes (positive reinforcement) since 8 weeks and is generally well behaved. My problem is his barking, he can bark all day everyday. He's very noise sensitive, any noise outside or inside the house and he will bark, and then he doesn't stop for a good few minutes. I think he's scared of these noises because he's always been nervous but I also sometimes think he's doing frustrated barks cause its an exciting noise and he can't get to it (like the cats jingly collar means there's a cat about he could be chasing) or he's in the kitchen but one of the other dogs has been taken away. He mostly barks at the tractor/quad bike passing, the gate opening, the door opening, the cat flap, a knock at the door, people talking in the living room if he's shut in the kitchen, the letterbox, the cats collar, doors opening and shutting, if one of the other dogs has been taken away. And if he's on a walk with one of the other dogs he will bark and lunge and other dogs but when he's alone he doesn't do this. About a year ago we got a qualified behaviourist in to try and help him, and we did all the things he suggested. We moved the stairgate from right next to the front door to the kitchen door which hasn't stopped his barking but he's not jumping at the gate when people come in the door anymore. We've stopped him being able to sit on the windowsill, as he would sit there all day watching out of the window before. Put a screen up in front of the kitchen door so he can't see out of the front windows. We tried using the plugin adaptil for a few months but it made no difference. We have tried a thundershirt for a few months and still occasionally but it made no noticeable difference. We tried various powders and drops in his food, like herbal remedies for calmness, which made no difference. We have tried a husher (which is like a bit of elastic that goes around his mouth to let him realise he's barking) but it didn't make a difference and even though I spent a long time introducing it he never really liked it on. We took him to the vet who said it was probably just the way he is, but prescribed him Clomicalm and we have tried distracting him when he's barking and treating him for going quiet but this hasn't made any difference. Most of the time he can't stop barking and can't focus on me he just runs back to the door/window and keeps barking. We have tried giving him frozen kongs and rawhide chews to occupy him and try to tire him out a bit, but he struggles to lie down to eat them and he often growls at the other dogs when he has them. And a couple of times one of my other dogs has flew at him and took a chunk from his ear, but if I keep them separate for his chews/kongs he howls and barks at being left alone. We also made a sound cd of all the sounds he barks at and played it really quietly in the kitchen and this did make a difference to his barking, but when our CD player broke he went back to the way he was before so we've made a new one but some sounds are too loud and some too quiet so it's hard to find a good volume. I've tried stooging the situations and getting someone to open the gate or knock on the door while I fire treats at him or scatter food, but he generally barks then takes a mouthful then barks etc. I know people suggest teaching him a speak command then teaching a quiet command, but I'm very reluctant to reward him for barking because I don't want to make his barking any worse. I've even tried shouting at him every time he barks (I know I shouldn't) and sometimes he looks at me then goes back to whatever he was doing before, but most of the time he carries on barking. I've got some brain games to try and keep him occupy him, the log with little squirrels in that he has to pull out and the dog food maze, but these just make him very excited. So I only really use them when he's already being mad to stop him bouncing off the walls. We have had some victories. He can now walk around the block without lunging at cars or cowering at tractors, although this took 5 months and a lot of food. Although he is still scared to death of motorbikes. He will also walk with his tail up and wagging, rather than tail between his legs and him cowering low to the ground and pulling. He has passed his KC Good Citizens bronze and his APDT foundation award. And he can go to agility classes without barking at the tunnel or dogs going through the tunnel, and only does occasional mad laps of the room. It doesn't help that the other two dogs are reactive as well so sometimes they will bark first at a noise and it sets Teddy off. I feel like I've hit a brick wall and I don't know what to do now. I've fixed most of his problems but I just can't crack his constant barking. Can anyone help us?