How do I teach my dog not to chase pigeons?

[ilikepigeons]

Our dog has a history of chasing pigeons, it wasn't a big deal until recently since he has no intention to catch them and we always look before letting him out, and it was only a rare accident that he would chase them. But now I have feral pigeons who I am trying to get to live in a shed on my place, and those 'rare accidents' are just totally unacceptable since just one accident totally terrifies these feral pigeons and is a huge setback since they usually get chased when they are on the ground eating inside of the shed, they get negative associations and it takes a long time for them to get relaxed again.
The rest of the people in the house really don't care enough if at all and don't want to train him, so I said to keep him inside the house at all times except walks and toilets. Just recently I was walking with him back to the house when he saw two pigeons in the shed, one of my rollers and one of the ferals, finally happily perching inside of the shed for the first time I'd ever seen. I tried to grab him and firmly said 'NO' but he didn't even look back, down there like a rocket, barking and the poor birds took off. I don't ever get angry at him for it because it's not his fault but I was just really sad because after months of work with those pigeons ofcourse the dog has to undo it all yet again. Now he's sad too because I'm sad, and it's just getting nowhere. Not sustainable to try keep him inside clearly, so I guess the only other option is training him to leave them alone. I haven't found much on it from my own research, so I came here to ask if anyone knows a good positive reinforcement training method to teach him to leave the pigeons alone?
He's a fox terrier mutt, 3 years old. I think for some reason it is people who set him off because there's been times he's just sitting the grass next to the pigeons who are also on the ground, but as soon as someone thinks to get the dog he takes off chasing them. He doesn't listen hardly at all, not even if I shout no at him. There's only one time I've managed to stop him, which was physically blocking him. It is only a problem when the bird are on the ground or very close to the ground, generally if they're up high he'll leave them alone. He just runs and barks, has never tried to catch them even though there have been times he could've.

 

[nchls school]

I have dogs and pigeons. It sounds like a hard job for you to train this dog which is easier with a pup; especially when the habit has become so ingrained. One of my dogs has the same habit. My efforts to train him were unsuccessful, but in the end it did not matter. Pigeons are intelligent. In time the birds will simply fly out of the way and return to what they were doing when the dog is gone; just as mine have done. As my flock learned the dog was not going to kill them they flew shorter distances and then just walked out of the dog's way. My dog quit chasing when the birds stopped flying in fear. Took the fun out of it.

Is there a way you can make a little door into the shed higher up so the dog can't keep the pigeons from going in?