questions:

When is their first heat?
Pregnancy length?
How many heats per year?
Average amounts of puppies per litter?
thanks much

Hi guest.
Golden retrievers are like other breeds in most espects, so why don't you buy the Book of the Bitch, which will answer all your questions. A good specialist breed book would be invaluable too. Why don't you join one of the Golden Retriever bred clubs, and have all those experts available to help you?