This pair of jaws are from a field trip back in January during which I also found a deer skeleton. Each jaw is about 9 cm long. Both are missing the incisors and the canines.
I found them in a hedgerow on one side of which was a farm field and on the other side a hill leading up to a residential building. I am suspecting that they belonged to either a small fox or a small dog. Raccoons seem to have a more curved lower jaw. I don't have enough expertise to tell the lower jaw of a fox from that of a dog. In fact, it may not be possible to reliably distinguish the 2 species from each other only from lower jaws unless large samples are available to do a statistical comparison.