Several signs of parasites in dogs:

1. The dog always scratches with its paws or shakes its body and head. This may be There are scabies mites, lice or ear mites on the body.

2. There are scabs and pustules on the dog’s body, and even hair loss. These are most likely caused by scabies mites.

3. When combing the dog's hair, I found small black particles. The particles became blood-colored after being dissolved in water. This may be because your dog has fleas.

4. The dog suddenly became thin and the ribs were obvious. But eating and drinking are normal. This may be because your dog is infected with internal parasites such as tapeworms, roundworms, and hookworms.

5. The dog often coughs or has shortness of breath, but does not have a cold or other diseases. It could be that your dog is infected with heartworm or Toxoplasma gondii.

6. Bugs were found in the dog’s vomit or stool. This is most likely a roundworm infection.

7. Dogs often have diarrhea, but have a good appetite. This may be because the dog is infected with tapeworms or roundworms.

8. The dog has black or bloody stools, or there are white particles and worms in the stools. This could be an infection with hookworms, whipworms, coccidia, roundworms, or tapeworms.

9. The dog’s gums and eyelids are very pale, which indicates that the dog is anemic and may be infected with some internal parasites.

10. The dog often rubs its butt on the ground and is itching unbearably. This is very likely to be infected with tapeworms.