Comfortis for Dogs 20-40 lbs, 6 Pack (Green)Comfortis for Dogs 20-40 lbs, 6 Pack (Green) pet medications treat flea infestations in dogs 14 weeks and older.Comfortis once-a-month chewable tablets use spinosad to provide flea control for dogs and prevent infestations for one month. K and the days of summer
