http://www.petmd.com/dog/conditions/toxicity/c_dg_ivermectin_toxicity?page=show

http://www.vetstreet.com/ivermectin--pyrantel-pamoate--praziquantel-rx

Ivermectin is used once a month . They do sell Fenbendazole for dogs at tractor supply with no prescription needed as an alternative . I believe the dose for Fenben for dogs is 50 mg per kg for 3 days in a row every month . I rotate between moxi and Fenben for my dogs each month . They have been wormed since puppies and get tested every year . Moxi I get from vet and Fenben I get over the counter .

http://www.thedogplace.org/PARASITES/Dog-Wormers-Dosage-Chart_Lanting-09.asp