Duncan cut his pad fairly severely about a month and a half ago and I took him to the vet because he was limping. You could see the inside of his pad through the cut. The vet recommended that I don't bandage it as it will heal quicker open but to put a plastic bag over his foot when we went outside to the bathroom. She wanted him to wear an e-collar to prevent him from licking it but that doesn't work with Duncan! He has it off in 30 seconds flat! So I just kept an eye on him and told him NO when I would see him licking it! He learned fast. He also learned how to hide it from me! It was hysterical....he would face away from me and pretend to be sleeping but I would see his head moving slightly.... Anyway,she said the first sign of healing I would see would be white granules on the cut as it closed up.
Duncan limped on that foot for almost 3 weeks!!! Being the nervous mom that I am, I brought him BACK to the vet but they said he fine! I was concerned about the pain he was in so they told me it would be ok to give him some coated aspirin....

I hope your lab is doing OK now, and Jazz too!