Quote:
Originally Posted by kjc  Age is more important than size.
You don't want to spay before her hormones kick in. This causes growth plates to close, makes them lose their puppy behaviors and act more like an adult, and signals changes that need to occur in her development.
Spaying too early prevents these changes from happening.
IMHO, best age to spay is between 8-12 months. |
I think every dog is different as to when their growth plates close; age should be determined by the vet and owner after physical examination.
The real problem with spaying/nuetering before growth plates are closed is due inhibiting the proper hormones to be distributed to the body that would prevent the possibility of cancer.