Give this medication exactly as directed by your veterinarian. Do not give more or less than is prescribed by the veterinarian. If you do not understand the directions ask the pharmacist or veterinarian to explain them to you. The usual dose of Percorten-V in dogs is 1mg/pound given by IM injection every 25 days. Store Percorten-V at room temperature away from moisture and heat. Keep this medication away from children and pets.