Dogs should generally be wormed regularly as a preventive measure. For puppies, worming typically starts at around three weeks old and is repeated every two to three weeks until they are about 16 weeks old. After that, and for adult dogs, worming every one to three months is commonly recommended, depending on the dog's lifestyle and risk factors such as scavenging or hunting. Adult dogs that are less exposed to such risks may be wormed every three months, while dogs in higher risk situations might need monthly treatment. It is also important to use worm treatments that cover different types of worms, including lungworms. Regular worming is essential to protect both the dog and household members from parasites.