I have recently gotten a great Dane pup, and only want the best for my new 'child' , she won't be bread and will be desexed , as I dont support back yard breeding , I believe there's a general age of 6 months when puppies get desexed, but ive recently read that with Danes not to 18 months due to growing, what's ur opion on the matter and if u agree with 18 month and why and any tips to keeping other dogs away from her?