The small black bugs on dogs may be external parasites:

1. Fleas: It is one of the most common external parasites on dogs. The strong contagiousness can cause itching and even allergies in dogs. If not controlled, it may also cause acute eczematous dermatitis and make the affected area suppurate. Owners also need to perform regular external deworming on their dogs. Fleas are usually contracted from weedy environments, so owners should reduce the frequency of taking their dogs to the grass and increase the cleaning of their homes.

2. Scabies mites: The development of scabies mites is completed in the host body through eggs, larvae, nymphs and adults. The danger of scabies mites is that they can be cross-infected between dogs and owners, with an incidence rate of about 25-30%. Typically as long as a dog infected with scabies is treated, the owner's injuries will improve quickly.

3. Ticks: also known as ticks, grass crawlers, and dog beans. The main bites are on the sparse hair on the dog's body, the abdomen is flat and black, and it continuously sucks blood. Ticks have a strong ability to transmit diseases. You can use external anthelmintics, alcohol, etc., and drop them on the area where the tick bites. Wait for the tick to loosen its mouth, and then disinfect the affected area.

Abnormal symptoms of worms outside the dog’s body:

1. Skin flakes. If your dog suddenly loses a lot of dander, it may be caused by parasites.

2. There are many black spots on the hair. If you look through your dog's hair and find a lot of black spots, and the hair is blood-colored when dissolved in water, it may be caused by fleas.

3. Frequent scratching. If your dog scratches frequently, it may be infected with parasites, which is causing the itching.

4. Keep shaking your ears. If your dog shakes its ears frequently for no reason, it may be infected with mites.

5. Rub your butt on the ground. If your dog frequently rubs its butt on the ground, it may be infected with parasites and feels that rubbing the ground can relieve the itching.

6. Abnormal hair loss or a large number of pustules in certain parts of the body. Observe the dog's body. If there is abnormal hair loss in a certain area or a large number of pustules on the body, it is also infected with parasites.