Capstar Flea Treatment is the safest oral flea treatment for dogs & Cats at Walmart. Now your pets will always live healthy with this 6-Count package of Capstar Cats and Dogs Flea Treatment. The Capstar is Approved by the FDA. It works on pets that weight under 25 lbs or that are at least four weeks of age or older, and it comes in an easy-to-swallow tablet form with or without food. This Capstar Petsmart treatment is effective immediately, best oral pet flea control.