Rufus was castrated at 17 months. He was completely sleek before. His coat changed a bit, but not as much as his friends who were neutered earlier or who already had thick coats. I was worried, but because of his chase behaviour, I was worried about his safety. Since he was castrated, he has calmed down-but that might be maturity. He is the same delightful dog at home as he was, gentle and friendly. It did not help with his hunting or recall, but the long distance bog -offs did reduce. Although I was nervous at the time, I do not regret the castration.