My dog was a very powerful German Shepherd. If I tried to chain him with a large, heavy duty guard dog choke chain, he would just pull on it until the large rings on the end elongated, then he would slip out of it, or simply let it get loose, twist it up between his ears, and then let it fall off. So I had to get a regular section of ¼” chain, with a “S” link, put it over his head to the point where he absolutely COULD NOT slip out of it, and pinch the “S” link together (with vise-grip pliers) so the collar would not/could not come apart or be destroyed. Then I made a length of ¼” chain, the same stuff as the collar, that was about 21’ long with brass heavy duty swivel clasps on each end. What I did next is not what I’m going to tell you. Make the length of chain about 25’ long. Dig a hole in the middle of the yard far enough away from any objects that the dog make get tangled in, and deep enough to completely bury a concrete building block. Tie the chain around the block and bury it. Tie the dog to the other end of the chain. This is about the only thing you can do with a dog like yours, who sees every attempt you make to contain him as a game that he must circumvent. Remember! Desperate times call for desperate measures, ESPECIALLY when it comes to dogs that are as driven as yours to get away!!! You GOTTA play for keeps! What I did to my dog, which, of course you can also do, is to secure a section of ¼” aircraft cable to the house (near the back door) and the other end to a outbuilding and hook the other end of the chain to this cable so the dog has run of the entire yard. Be careful the dog can’t get hung up on anything and hang itself! This method may be more difficult because the dog can get tangled on more stuff. I would suggest the buried concrete block.