RXJ CapShield Dog & Cat is a skin supplement for managing flea infestations in dogs and cats, formulated with Nitenpyram to begin killing fleas within about 30 minutes. The active ingredient remains in the bloodstream for 6 to 12 hours, with effects lasting up to 24 hours, and may be given once daily as needed or for continued protection. Made in the USA, it is well suited for indoor pets. The 11.6 mg tablet is recommended for kittens, cats, puppies, and small dogs weighing 2 to 25 lbs, while the 56 mg tablet is intended for dogs over 25 lbs.