Getting into calling position without being detected is just as important as camo.
A resting coyote will be on the downwind side of a hill looking downwind and sniffing upwind. Use this to your advantage.
Be very careful as you crest a ridge, try to hit a low spot on a ridge to get to your calling position or cross a ridge and then work your way up or down the ridge below the skyline.
Try calling less and use more obscure sounds.
Get further from the beaten path to find less educated critters.
Know where your scent cone is and use it to your advantage, the dog will end up in it if you don't shoot it first.
It will get better as it gets colder. Dogs get educated by lots of deer elk and antelope hunters but with the season's over and survival becoming their biggest concern they will become more callable.
Really all you have to do is get to your stand without them seeing, smelling, or hearing you. . . give them a sound that they can't refuse. . . see them before they see or hear you while you move your gun into position. . .and shoot them before they hit your scent cone
There is really nothing to it. . . . .
Well other than the fact that even when you get all of that perfect, sometimes the coyote doesn't play along.