Get your cat some free Purina Muse Grain-Free Filets cat food! Register or sign into a Muse Rewards account. Click the ‘My Account’ link and be sure your mailing information is added to your profile & current. Anyone that is or becomes a member of 4/26/18 will automatically receive a free sample of Purina Muse Grain-Free Filets! This offer was advertised in their latest newsletter.