I am fostering a dog who was left chained to a fence outdoors for several days. Inside our house, he is friendly and very affectionate with all people. He has a healthy, shiny coat, he's extremely well house-trained, he's reasonably obedient, and he hardly ever barks. (These factors lead us to believe that pre-fence, he was probably in a good and caring home that trained him well.) Inside the apartment, he's a dream dog.
When you get him on a leash outside, he's a totally different dog.
As soon as we get out of our apartment, he jumps up to get the leash in his mouth. He will not walk unless he is holding the leash in his mouth. Periodically, he will stop and shake his head (leash in mouth) very hard, and pull backwards, tug-of-war style. When he's walking (and not shaking or pulling), he pulls forward like mad. He is a little bit responsive to me while doing this. I've been employing the strategy wherein I stop immediately when he starts pulling, and he will sit and wait for me to allow him to continue walking. When doing so, he's frequently exhibiting scared dog body language and shaking.
Things have improved a little over the month he has been staying with us. After a few loud "NO" corrections and changes of direction, I can usually get him to stop shaking his head and tugging backwards. The stop-and-wait strategy has gotten him to pull a little less hard on the leash when he's walking forward, but he's still pulling hard, and he simply will not walk without the leash in his mouth.
When anyone else other than me walks him, he's immediately back to square one - all the improvement vanishes, and he exhibits "scared dog" behavior more frequently.
When we are done with our walk (drag) around the block and get back home, he is reluctant to put down the leash after I've unclipped it from his collar. But once he drops it, he's back to his cuddly, tail-waggy self.
My theory is that he has major anxiety about being on the leash because he was tied to a fence with a chain leash, which meant he couldn't pull it loose or bite through it to get himself free. It seems like this experience means he wants to be able to control the leash himself. This is conjecture, though.
Patrick is a foster dog of unknown origin, but he seems like a pit bull/lab mix, fully grown at about 65 pounds (estimated), reasonably young (4 years old or so), not neutered (yet). We are using a regular canvas/webbing collar and leash.
How can I help this little guy?