As a child, my favorite pets were the backyard moles, until one bit me hard one day and that ended that, lol. I remember how much it hurt.

One word of caution............... moles can also carry rabies, so perhaps a visit to your vet is in order and to keep a close watch over him for the next 10 days. Perhaps a booster with another rabies vaccine is in order too. I had my round with a rabies incident years ago, where I was bitten by a feral cat, so my health department thoroughly educated me on this subject. Anything warm blooded can get rabies. Let's hope this is not the case for you, but it's fortunate you found the source of your dog's misadventure.

Chances are this is little critter doesn't have rabies. The reason I say this is there are two types of contact with rabid animals, one is called a provoked attack such as the interaction between your dog and the mole and an unprovoked attack where the animal comes up and bites for no reason. The unprovoked attack is usually one sign of an illness, such as rabies.