SelaSpot Topical contains the active selamectin, the same active ingredient in Revolution® Topical. Selamectin is a proven parasiticide against fleas, heartworms, ear mites, sarcoptic mange, and tick infestations due to Dermacentor variabilis in Dogs; and against fleas, heartworms, ear mites, roundworms and hookworms in Cats. SelaSpot is a cost-effective option for vet clinics, shelters and clients. An affordable monthly topical prevention that may lead to improved compliance. SelaSpot Topical is available in dosage strengths and volumes to accommodate Dogs and Cats of every size.