Ideally wound should be handled by the vets. Wound in your dog has become infected that is why puss is coming from the wound. If your dog is having minor infected wound then wash the wound with warm and and Epsom salt and then apply topical antibiotic and keep the wound covered.
If the wound is deep then you might not be able to handle it. This require topical antibiotics along with oral. In this case, take your dog to vet for proper dressing of wound and prescription of most effective medicine.
If the wound is deep then you might not be able to handle it. This require topical antibiotics along with oral. In this case, take your dog to vet for proper dressing of wound and prescription of most effective medicine.