I don't doubt it makes some sort of difference... My friend in Akitas says the lanky look is about it...no increase in HD...ACL tears...Thyroid...Incontinence...shortened lifespan, bloat etc. that could be attributed solely to the surgery and not the fact that ALL the above, occur in the breed no matter how much you test. I'd put the s/n thing in with microchipping...it has definite at times life saving benefits...it is something that can help a breeder keep some kind of control over the dogs that leave their property. It is something the new owner will either accept or move on (some people really freak out if you chip a dog and want to in any way stay on the chip, even as secondary contact/chip buyer)...and it something that CAN cause an issue later...since chips have been associated with cancer risk...sometimes...in some dogs...go figure if it would have occured anyways, or has a genetic basis. BTW OP...chipping your puppies is another way to keep track of them even if the people don't want you to...but as I mentioned...some folks have an issue with that, too.