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At first glance photo #2 is very foxy looking. The other two shots are definately coyote looking.
It COULD be a coydog (they are everywhere, it seems), but my guess would be that this is a juvenile coyote with its first year coat intact.
There is an amazing variability in physique/build, ears, nose, etc., as you move across the U.S. For instance, even in summertime Yellowstone area coyotes seem to be heavier in body than the long-legged skinny characters you find in the far southwest.