How often should golden retrievers be dewormed externally?

If the puppy is less than six months old, it is recommended to be vaccinated once a month. If it is older than six months, it can be vaccinated once every three months. Because it takes about three months for internal parasites to grow from eggs to adults, external deworming drugs such as Fulian and Dapai generally only last three months, so it is recommended to deworm every three months.