Below you will see some of the common preditors, as well as other wildlife, that shares the running grounds with you and your hounds. While we do not see most of them, we do see their tracks and droppings.
Most of us that run hounds are also hunters and already know their tracks. The information below is just for some general knowledge of who or what is sharing the grounds.
This guide from the MassWildlife gives a general idea of what is out there.