Why do dogs lick their wounds?

Licking of wounds by dogs:

Weird, Right? Dogs and other animals do not have 

proper medical treatments for the infections and wounds. Licking helps them cleaning their wounds. The saliva of dogs contains some anti bacterial and antiviral enzymes like lysozyme. When dogs lick their wounds, the lysozyme present in their saliva will break the cell wall of the pathogens and kill them. It's saliva also contains the tissue factor which promotes blood clotting and thus stops bleeding in their wounds. Besides, licking helps to remove the dirt from their wound. But mere licking is harmful because the dogs saliva may also contains small pathogens which aggravate the wounds. Hence, now a days dogs are made to wear elizabethan collar to prevent licking.