New in box. 1 month treatment. Expiration date September 2026. Retails for $35. Credelio Quattro is a monthly chewable tablet for dogs that protects against six types of parasites: fleas, ticks, heartworm disease, tapeworms, roundworms, and hookworms. For small dog, or puppy over 8 weeks old, weighing between 3.3 and 6 lbs.