The reasons why puppies keep biting their tails:

1. It may be skin disease, parasitic infection, fungal infection, etc., which will cause eczema on the dog’s tail , it will be very itchy, and then it will bite its tail continuously.

2. It may be anal adenitis. If you rub your butt while biting, it may be that your anal glands are blocked and you need to squeeze them.

3. Self-biting syndrome. Dogs bite certain parts of their bodies to attract their owners' attention or to express boredom.

4. It may be physiological tail biting. It's just pure play.

5. It is also possible that the dog is malnourished. Malnourished dogs will bite their own tails or eat their own poop.

6. If the dog’s tail has excessive dandruff, hair loss, redness, swelling, or oozing, one dog will also bite its tail.

7. When there is dirt on the dog’s tail, the dog will bite its tail and lick its tail hair because it feels uncomfortable.

What to do if a dog bites its own tail:

1. The owner can observe whether there is any parasitic infection on the dog. When a dog is infected with parasites, it will appear in a chewing state and may bite itself. At this time, the owner needs to deworm the dog.

2. The itching may be caused by atopic dermatitis. There is actually no cure for atopic dermatitis. The only way is to eat hypoallergenic prescription food or cooperate with anti-inflammatory treatments.

3. This situation will also occur when the dog's skin is infected by bacteria, fungi, etc., with local redness, swelling, and hair loss. Take it to a pet store for treatment promptly.