Most treatments take only a few days. However, periodic checking is necessary to be sure that all intestinal worms have been eliminated. A fecal sample should be reexamined about three to four weeks after the deworming. Your veterinarian may request an additional fecal sample at a later date. Once the problem is treated, it makes sense to prevent reinfection.
Bowel movements are the greatest source of most worms.
To avoid worms, keep your pet away from areas where other animals have relieved themselves and dispose of bowel movements as quickly as possible in your own yard. Under some conditions of poor hygiene, worms can be transmitted to humans. Discuss the risk of human exposure with your veterinarian. If you suspect the presence of parasites, consult your veterinarian immediately. Sometimes healthy, well-fed pets do not show signs of intestinal parasites.