Symptoms of dogs that have not been dewormed for a long time:

1. Keep scratching. If you scratch the same area frequently, it may be caused by lice, fleas, scabies mites, etc.

2. There are erythema and dandruff. Scabies mites appear as red spots on delicate areas of the skin. In severe cases, a large amount of dandruff may appear, and there may even be blisters or pustules.

3. The anus is close to the ground. In addition to anal gland inflammation that causes dogs to rub their butts, tapeworm infection in dogs is also an important cause.

4. Eat too much and not gain weight. Due to the presence of roundworms or hookworms in dogs, it is easy to cause digestive system problems, causing dogs to not eat fat or become very thin.

5. Frequent coughing. It may be heartworm infection, which usually lives in the pulmonary arteries of dogs, causing coughing.

Methods to deworm dogs:

1. External deworming. Dogs infected with external parasites such as dog lice, fleas, and mites can generally be killed with a medicinal bath. If it cannot be removed completely, you can use an external spray to sterilize and deworm your dog.

2. Internal deworming. If a dog is infected with internal parasites, such as hookworms, nematodes, roundworms, etc., the dog can be given medication. If the symptoms still do not disappear, you need to go to the pet hospital for treatment.

3. Home disinfection. In order to prevent repeated infections, while taking measures for dogs, the living environment must be disinfected and dewormed, and the dog's supplies must be cleaned regularly to reduce the spread of parasites.