The reasons why dogs keep scratching their ears and shaking their heads:

1. If your dog scratches its ears frequently, it must be because there is foreign matter in the ear. It may be that there is too much earwax, so the pet owner needs to clean the dog.

2. Many pet owners bathe frequently in order to keep their dogs clean and hygienic. Sometimes water or bath products are poured into the ears during bathing, which can also cause itching. Sometimes they do not blow in time after bathing. If it is dry, the ear canal will become inflamed in the long run.

3. If the dog's ears are infected with mites and the dog keeps scratching its ears and shaking its head, it is necessary to check the dog's ear canal in time and clean the dog's ear canal regularly.

Symptoms of ear mites in dogs:

1. It usually causes a large amount of ear fat secretion in the ear canal, and is prone to secondary suppuration.

2. The ears of dogs infected by ear mites itch violently, so the dogs often shake their heads and scratch their ears, which may sometimes cause bleeding in the external auditory canal.

3. When a dog is severely infected with ear mites, the lesions will spread to the dog’s forehead and behind the ears.

4. Dogs infected with ear mites will have dark brown wax and exudate in their ears. After dog ear mites spread, the affected dog may also develop epileptic symptoms.