Easily treat flea infestations on your dog or cat with the over-the-counter equivalent to Capstar (nitenpyram). Sentry Capguard (nitenpyram) is an oral tablet flea treatment ideal for when your pet is likely to be exposed to fleas, such as when taken outdoors, when boarding, grooming, or prior to surgery. Capguard is not a preventive; it simply treats your pet’s infestations. Safe enough to give as often as once a day. For dogs, puppies, cats, and kittens 2 lbs of body weight or greater and 4 weeks of age or older.