Because by then they should be hormonally mature even if not fully structurally mature. I don't read much research - I follow experience !
Ideally, not at all, but if they MUST be spayed, then let them grow up first.
This is Roo's Vet and the Services he offers
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I feel we have a pretty Unique Vet. We live in the Champaign Illinois area which is home to the Vet School at the University of Illinois.
Our Vet was a physical therapist for people first, and then decided to go to Vet School, so he brings an interesting mix to his practice.
His practices is called SportsVet Animal Medical Center and he is located in Savoy IL. Here is a link describes his unique practice.
http://www.sportsvetamc.com/about_us.php
Jason
