I can't remember exactly. I think we are at around 15 now. You can ask on the PennHip Facebook page to be sure, if you want, they are great about responding. I am planning on adding Corgan and Asha to the database later this year (Corgan in April, Asha when she turns 2). I think Jing will be testing her dog later on, and hopefully my other puppy owners from the A litter will also test (though it would be great to get a variety of lines from all owners). That should get us over the 20 dog hump...yikes, hill probably sounds better than hump...