Why do animals lick their wounds and why people are not recommended to do this?

Let’s start with the fact that in the saliva of a mammal is a powerful bactericidal chemical compound – lysozyme. In the process of evolution in a person who began to consume cooked food, the concentration of this substance decreased, therefore, favorable conditions for the reproduction of microorganisms were created in the human oral cavity. While in the rest of the class, the concentration of the substance remains quite high (for example, in dogs, even sometimes severe wounds received in the street environment, heal relatively quickly due to abundant wetting of the wound surface with saliva). If human saliva gets into a wound, it can lead to suppuration and more serious consequences.