I have a lovely young Great Dane female patient who is currently 15 months of age.  As a giant breed, the owners and I had collectively decided to push off her spay to after 14 months of age.  Also since she is a deep chested giant breed dog and therefore susceptible to bloat and a life threatening complication of bloat called gastric torsion, I suggested since we open her abdomen for the spay anyway, that we tack her stomach to her body wall; a preventative procedure called gastropexy.