Male and Female Carolina Dogs.
The male is on the left in the first two photos and on the right in the last. It was an older animal and because of this most of the sutures are fused and the teeth, especially the front incisors, are very worn.
It’s a much more heavy and robust skull than the female.
The female (right in the first two photos and left in the last) has a really cool dental pathology. She never developed either upper rearmost molars (visible in the last photo). She also never grew in a small upper premolar.