I have an 18 month old male whippet who has one retained testicle. I know this has been a hotly debated subject in the past, but I am really in need of other peoples' advice and experience. I have decided to have the retained one removed, and am happy with that decision. However, I am still unsure as to whether to have him fully castrated. This is not on ethical grounds (if it remained, I have no intention of breeding from him, so there is no issue there), rather because he displays none of the aggressive or sexual problematic behaviour (except occasionally showing a little too much interest in bitches) that people cite for reasons for castration. Also, castration reduces aggression and makes dogs more passive. As he has so little aggression in him, I am afraid it will actually have a negative effect on him, by removing his testosterone, will it actually make him more timid? He is, by nature, a bit of wimp, and I love him for that, but I wouldn't want to make him any more of one!