Diane - I am so pleased that your reason for breeding her is to improve the breed. Read - read - read....phone the breeder of your girl, contact other Lab breeders. You are correct in thinking that its more like a financial loss too.....it usually is - the money - time - love - effort etc put into those babies will far more out weigh what you will gain once you sell them. Good luck with whatever you decide. As for the stud dogs - look into her lines - look for a dog that will compliment her - look for what you would like to improve upon etc etc....I am sure the Lab breeders will help you far more than anyone on this forum as only you and the lab breeders can answer questions about the lines and stud dogs....