I have 3 unopened packages of Advantage Multi for dogs 88.1-110 lbs. Each package has 6 doses. I'm asking $50 for each box or I'll go cheaper if you buy all 3. Treats fleas, roundworms, hookworms, tapeworms and heartworms. Since it treats heartworm you should call your vet first and make sure its ok your dog is on heartworm preventative.