Let's be honest, worms are a pretty unpleasant topic! To ensure you never experience worms in your home it is important to stick to a worming schedule appropriate to your pet's age and lifestyle. One of the most important things to know about worm treatments is they have no lasting effect. A worm treatment simply kills the worms present in your pet's system at the time but will not prevent reinfection. At a minimum, adult cats and dogs should be wormed at least every 3 months. However, animals less than 6 months old and pets considered 'high-risk' should be wormed more frequently. Low-risk animals, such as indoor pets should still be wormed regularly. Contaminated soil can be brought inside on your shoes or other pet's paws which could infect your indoor pets.