The reasons why the dog keeps scratching itself but there is nothing on it:

1. If the dog scratches itself frequently, it may be that the dog is suffering from a skin disease. The first thing to do is to see Check whether there are red spots, hair loss, papules or dandruff on the skin. The dog will continue to scratch due to the itching caused by skin discomfort, which will make the condition worse and worse.

2. Take your dog for a checkup. If there is itching on the body caused by mites, fungi, bacteria, or microorganisms, timely symptomatic treatment is required.

3. If a dog has trauma, it will itch due to skin regeneration during the recovery process, and it will instinctively scratch.

4. If the dog does not take a bath for a long time or uses human shower gel, it will also cause the dog's skin to itch, and the dog will not be bathed too frequently.

What to do if your dog keeps scratching itself:

1. Take your dog to the doctor promptly. If it is caused by a skin disease, you must first remove the hair from the infected area. Use symptomatic drugs and sprays for treatment, as well as medicated baths, so that you can recover quickly.

2. If it is caused by microorganisms, mites, bacteria, etc., external anthelmintics should be used to kill parasites.

3. If the dog bathes frequently or the shower gel is used improperly, the bathing frequency should be adjusted in time and a suitable shower gel should be replaced to solve this problem.

4. If the dog has itching and scratching caused by a wound, you can wear an Elizabethan collar on the dog to prevent the dog from biting the wound and causing secondary damage by scratching.