How is your dog's foot doing? I know it was several days ago and you were heading to the vet but I would like to make a suggestion. I usually head to the vet but I also keep one of those lovely plastic cones at home for each of my dogs "just in case". They can really help to stop the licking by limiting the dog's ability to reach the injury. Licking is the enemy of healing. As the dog licks at any wound bacteria is being introduced and the wound is being kept very moist. Bacteria LOVE warm moist environments! Licking also damages the skin and delays healing. Pads can be really tough to heal. Every time the dog steps on the foot the pad flattens and spreads, this action pulls apart any laceration with every step undoing part of the body's repair work. Seek advice from your vet, stop the licking, keep it clean and dry. Watch for signs of infection such as redness, swelling or discharge especially if it is getting worse and try to keep the dog as quiet as possible. Again I hope your dog is 100% and this is unnecessary advice.