The dosage for dogs 30-44.9 lbs is ? of a 16 mg tablet twice daily. The dosage for dogs 45-59.9 lbs is two 5.4 mg tablets twice daily. The dosage dogs 60-89.9 lbs is one 16 mg table twice daily. The dosage dogs 90-129.9 lbs is 1? 16 mg tablets twice daily.