Causes of dogs drooling:

1. Heat dissipation. Dogs are different from humans in that they are born without sweat glands all over the body, and their heat dissipation method is very simple, and they can only use their tongues to dissipate heat. As soon as the tongue sticks out, a lot of saliva will come out.

2. Heredity. Drooling in dogs is related to breed genetics. For example, some dogs with wider and larger mouths love to drool.

3. Conditioned reflex. Dogs will drool when they are excited. This is an instinctive conditioned reflex. Dogs will also drool when they see delicious food, and their mouths will secrete a large amount of saliva.

4. Oral diseases. If the owner fails to rinse and brush the dog's mouth, bacteria may accumulate in the dog's mouth, leading to oral problems. At this time, the dog will drool more.

5. Replace teeth. When a dog's teeth grow, the teeth continue to stimulate the salivary glands, which will lead to an increase in secretion. In addition, the puppy's swallowing function is not perfect, which will also cause the dog to drool.