HI there and thanks for the question.
Neutering is a great idea for dogs of all age. It has some affect on interdog aggression, some mild affects on dominance aggression but most importantly stops testicular cancer which is very common and also prostate problems which are common in old dogs.
Affecting his behaviour will only be a minor effect.
At his age he will need some special considerations including possible pre-surgery blood tests, and special considerations during surgery eg fluids and the safest poss anaesthetics. Talk to your vet about it to hear there views.
Todd
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