Like DaySleepers said, he probably isn't getting much time to decompress and clear the stress hormones in a shelter environment. He's constantly surrounded by barking dogs, dogs walking past his enclosure, and other triggers, so he never has a chance to settle down.
Is there any chance at all that he could be placed in a foster program in a home without other dogs? This would give him a chance to decompress, and when he his stress is cleared you can begin counter-conditioning training. It sounds like you're doing a great job and trying really hard, but it's going to be difficult to make that training "stick" when he's immediately being exposed to his stressors again.
If a foster program isn't possible, perhaps try putting a visual barrier on the front of his enclosure so he can't see other dogs walk past (if you haven't already), which may make him feel more at ease. Is there any fenced outdoor areas for the shelter dogs to play? If so, try taking him out and playing fetch or tug for fifteen minutes or so before the walk to burn a bit of the crazy energy.
Make sure to bring the tastiest of treats when you go walking, and try to make it so he only gets those treats during walks. You want to make sure they're very special to him. I like to use tiny pieces of cheese, deli meat, or hot dogs.
Work on impulse control games, like "Doggy Zen". You can search it on this forum. It helps dogs learn to control their impulses and actually use their brains to get what they want instead of going from 0 to 100 in two seconds.
Also, try reading through the reactive dog sticky in the training forum. There are some great resources and ideas listed there!
Is there any chance at all that he could be placed in a foster program in a home without other dogs? This would give him a chance to decompress, and when he his stress is cleared you can begin counter-conditioning training. It sounds like you're doing a great job and trying really hard, but it's going to be difficult to make that training "stick" when he's immediately being exposed to his stressors again.
If a foster program isn't possible, perhaps try putting a visual barrier on the front of his enclosure so he can't see other dogs walk past (if you haven't already), which may make him feel more at ease. Is there any fenced outdoor areas for the shelter dogs to play? If so, try taking him out and playing fetch or tug for fifteen minutes or so before the walk to burn a bit of the crazy energy.
Make sure to bring the tastiest of treats when you go walking, and try to make it so he only gets those treats during walks. You want to make sure they're very special to him. I like to use tiny pieces of cheese, deli meat, or hot dogs.
Work on impulse control games, like "Doggy Zen". You can search it on this forum. It helps dogs learn to control their impulses and actually use their brains to get what they want instead of going from 0 to 100 in two seconds.
Also, try reading through the reactive dog sticky in the training forum. There are some great resources and ideas listed there!
