Open or closed mouth, does not matter. The bear head needs to be small (it was a yearling) but coyote can be average size. Change-out heads may work too since these are for hats/costume accessories, not normal rugs! These forms don't have to be in perfect condition, repairable damages are okay. So if you've got any laying around unused, let me know your price! I also have some tanned furs and a couple of antler sets I could trade. Thanks!