Heartworm disease can be a serious threat to dogs and cats; it can lead to lung disease, heart failure, and damage to other organs in the body. It can involve hospitalization with painful injections, which can be traumatic. Prevention is still the best treatment. Heartworm disease is transmitted to your cat or dog by infected mosquitoes, who got infected by feeding on an infected animal. Signs of heartworm disease are lack of appetite, weight loss, coughing, reluctance to exercise, and fatigue. Interceptor is a monthly, broad-spectrum parasiticide prescribed to help prevent heartworm disease. Plus, it treats and controls adult roundworm, adult hookworm, adult whipworm, and adult tapeworm (Interceptor Plus). 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. Interceptor has a powerful formula that works by attacking the nerve cells of these parasites, which paralyzes them and then eventually kills them. Interceptor is available in tasty flavored tablets as Interceptor Flavor Tabs for cats and dogs and Interceptor Plus Chewables for dogs and puppies. Interceptor has been trusted by veterinarians for over 25 years.