It is recommended that you use a worming medication for your dog every three months in order to target any eggs, larvae or actual worms that are living inside your dog's body. Tapeworms and roundworms are the two worms that are most commonly found in dogs, and for the sake of the health of your pet and your family, it is advisable to eliminate them as soon as possible. It is easy for a dog to pick up worms while exploring outside and unfortunately while there is no medication to prevent an infestation, regular treatments can nip them in the bud quickly. Indications that your dog has been infected with worms include vomiting and diarrhoea, a swollen stomach, tiredness and digestive problems. You can only be sure however by examining the faeces of your dog. Regular treatment removes the need to take part in this rather unpleasant task.