I have a dog bite that doesn't look that bad but it is very painful. What could be wrong?

I work as a dog groomer, and I am used to getting scratched and bitten. I have many scars all over my arms and hands. A dog today turned and bit into my thumb as I was trying to pick her up. The wound is right below where my nail bed is. It doesn't appear to be very deep but it bled quite a bit. It hasn't bruised yet but it is red and swollen close to the laceration. It is numb and tight, but a lot of the pain is on my knuckle even though there isn't any redness there. Putting any pressure on my thumb also causes sharp pain. I am so used to these things I know I am not just being a baby. Did I hit a nerve or bone maybe?