If you are hunting an area that gets hit by other coyote hunters mix up your calls. The dogs around my place will not respond to howls (unless it is after dark) or rabbit calls. Everyone and their brother that hunts public land seems to be stuck on rabbit calls. The dogs can get conditioned to avoid it. Bird calls is what draws them out a lot of times when they have been called to alot. Woodpecker, yellowhammer, crow, etc. A few weeks ago I spooked one that I had missed a shot at 2 days before and I pulled him back with a woodpecker call. He came running like he had never heard one before. Big mistake. I also notice that many coyote hunters will only hunt huge, wide open clear cuts or fields. A good patch of timber during the middle of the day with an old road running through it has gotten me a lot of song dogs when the wide open spaces were vacant. It works for cats as well. We use to shoot a ton of them up in the Taylor River area out of North Bend.