Aww the poor baby. Around here dogs get dewclaws removed right after they are born, all the trees and fields and such, so I cant say for certain what will ease his pain, but if I had to guess I would say peanut butter, cheese, and a nice big hunk of turkey.
Aww come on Mom, just a little bit of cheese?
I hope your big sweet boy is better soon, tell him Hermione sends her love to him. Her very droolie love.