Do you think this was a true Grey Fox, or a Red in a color phase? Very curious. We have some grey ones her also, not as numerous as the reds. But the true Greys can climb trees and I might be wrong but I think they are an animal that mostly inhabits the western US. I occassionally call in a fox, but do not shoot them unless they look mangey or ill. Starting to see more fox again though, seems like there were a lack of them around here for ten years or so. We had a litter of them near out house this Spring, it was fun to watch the mother carry cats, rabbits, and squirrels back to the den. I am not going to mess with them at all, as far as hurting them. I lip squeaked the inexperienced kits within 8 feet of me earlier this year, it was neat. Even wearing a white t-shirt they came to me and then just looked. I could have grabbed one of them. Dumb kids. LOL. It was really neat.
Also pairs of coyotes are the best. Usually a race for the meal you are offering. They seem to throw caution to the wind, at least as far as coyotes go. I love it when two respond at once. Try this, hang a turkey feather tied with thread to a doll rod out in front of where you are calling. Even a gentle wind will move the feather. The coyotes will fix in on the moving feather and give you just a bit more time to work and shoot. Dont waste your money on expensive decoys that make funny mechanical noises, just use a feather. Make sure you use thread, heavier string will not allow the feather to flutter in the wind.