Normally 3 or 4 at a birthing, but they can have as much as 6 at a time.
Average is 4 to 8 puppies but can be less or more. A breeder finds out about how many during their standard prenatal care for evaluation before and during free whelp.
There is more breeding and whelping basics information and links for you in the first link and the breed parent club is the second link.
q3525724.html#a2810229 http://www.essfta.org/ http://www.wildheirlabradorrescue.org/readingroom/what-is-a-back-yard-breeder.php
http://members.tripod.com/antique_fcr/goodbreeder.html
There is more breeding and whelping basics information and links for you in the first link and the breed parent club is the second link.
q3525724.html#a2810229 http://www.essfta.org/ http://www.wildheirlabradorrescue.org/readingroom/what-is-a-back-yard-breeder.php
http://members.tripod.com/antique_fcr/goodbreeder.html