The reasons and solutions for dogs always scratching and biting:

1. Bathing too frequently: Skin damage caused by bathing the dog too frequently will cause dandruff in addition to itching. If the problem increases, in addition to applying medicine to the dog in time, you should also reduce the number of times you bathe the dog.

2. There are mites on dogs, such as scabies, demodex, etc.: Mites can cause severe itching and lethargy in animals. If a mite infection is diagnosed, some mite-killing drugs, such as selamectin, will be used.

3. Bacterial or fungal infections may cause local redness, swelling, hair loss, scabs, etc. on the animal’s back hair skin, which can be treated with some topical ointments.

4. Parasites on the body surface: Parasites on the body surface, such as bites caused by fleas and lice, can also cause itching of the skin. External repellent drops can be used.

5. Allergic dermatitis: There are many reasons for allergic dermatitis in animals, such as food allergies or environmental substances in life. You can try taking some anti-itching medicine first.