Your dog just had op on monday at the back and she keeps licking could this cause it to bleed?

It is important to follow the instructions given to you by your veterinarian after your dog's surgery. If your dog is licking the incision, this could cause it to reopen and bleed. You should try to prevent your dog from licking the incision by using an Elizabethan collar or a cone-shaped collar. You should also keep the incision clean and dry. If the incision does start to bleed, you should contact your veterinarian immediately.