I shot a coyote almost exactly like this one last november. Mine had a very distinct ring around it's paw, and I believe that at one time, it was caught in a snare or trap. It took this dog almost an hour from the time I started calling till' the time I shot it. It came hobbiling in on three legs, and was a large male, who was very cautious. I got the entire scene on film, and you can see him limping in the whole way. The ranch where I was hunting has a state trapper come in every year, and I suspect he was the one who originally caught him. The wound looked very old, and the yote appeared to be very fat and healthy. His final demise was his love for all things venison, as I brought him in with fawn bleats. (My personal favorite call) Oh well, got to weed out the crippled and the lame too.