Methods to prevent parasites in dogs:

1. The most effective way to prevent parasites is to regularly deworm your dog internally and externally.

2. Bath your dog regularly and get plenty of sunshine.

3. Keep the environment clean and disinfect the home environment and dog supplies regularly.

4. Keep food and drinking water hygienic. It is important for dogs to drink water. If the water source is polluted, dogs are more likely to get sick.

5. When you go out to walk your dog, do not let your dog come into contact with the feces of other animals and unclean water sources, and do not go to places where ticks breed.

Symptoms of dogs infected with ectoparasites:

1. The dog will frequently scratch a certain part of the body or rub against the ground.

2. Sudden change in personality, irritability, and weight loss.

3. Loss of appetite, lack of energy, and abnormal hair loss.

3. In severe cases of dogs, erythema or scabs after scratching can be directly observed on the skin surface.