Ive seen a few forums on this topic debating the impacts of desexing at 6 months. But what I have noticed is that the impacts vary depending upon breed. e.g. the impacts to a small lap dog apper to be lesser than larger working dogs like my boy.
He is very close to 6 months old and still very much a puppy. I am concerned about the development and behavioral issues. Ive have read a great deal of anecdotal evidence stating that the dogs mental state often slows keeping them in a 'puppy' frame of mind when interacting with other dogs and people. I was told to wait for at least 9 to 12 months. Assessing the behavior of the dog and decide as appropriate for him. My vet was very non committal......
I would be grateful to hear from other border collie owners to learn from their experiences.