Dogs and cats get internal parasites by eating feces, infected animals, or contaminated toys. Sometimes worms can come directly from their mothers. If worms are left untreated, they can become dangerous and cause blood loss, coughing, diarrhea, weight loss, and inflammation. Drontal is a broad-spectrum dewormer for cats and dogs. Drontal provides a quick and effective treatment against tapeworms, whipworms, hookworms, and large roundworms. Drontal has a powerful formula that attacks the internal parasites making them detach from the host; worms are then destroyed in the digestion process. Drontal tablets are easy to give to your pets: just give the tablets whole or mix them in their food.