The reasons why dogs always drool:

1. Normal physiological phenomenon. Generally speaking, large dogs salivate more than small dogs. When they are overly excited, anxious or nervous, they will secrete a lot of saliva. If the weather is too hot or the dog has just finished exercising and the dog needs to open its mouth wide to breathe quickly, it will produce a lot of saliva. At this time, the dog should be given sufficient water.

2. Caused by rabies. If your dog starts drooling severely, he may be infected with rabies. The dog's voice will gradually become hoarse and saliva will gradually increase. The mental state is restless, the color of the body hair is rough, the expression is dull, and the saliva is drooling. Abnormalities can be seen at a glance, a bit like the symptoms of epilepsy.

3. Separation anxiety disorder. Dogs will also drool a lot when they are stimulated by the outside world or frightened, but when the inducement is eliminated, the dog will return to normal. For example, a dog with separation anxiety may salivate a lot when it knows its owner is leaving.

4. Teeth and gum problems. Tartar, cavities, and gum inflammation can cause pain in your dog's teeth and gums, stimulating the salivary glands to produce excess saliva. In this case, the owner can gently lift the dog's upper lip to check the teeth, and perhaps see the accumulated tartar. At the same time, gum inflammation will cause the dog's face to become swollen, so the owner can clearly detect the problem. The best way to prevent dental and gum problems is to clean your dog's teeth regularly.

5. Dogs are greedy. The most common reason dogs drool is greed.

6. Teeth replacement period. When dogs are teething, their salivary glands are constantly stimulated, resulting in increased saliva secretion. In addition, their swallowing function has not yet been fully developed, so they will easily drool. When a dog is teething, his teeth will be in unbearable pain, which may cause the dog to bite randomly.

7. Food poisoning. If a dog accidentally eats unclean or toxic food and is poisoned, it will also cause severe drooling, accompanied by dilated pupils, accelerated heartbeat, diarrhea, vomiting, and coma. If you find that your dog has symptoms of food poisoning, you should send him to the hospital for treatment in time to avoid delaying the best time for treatment.