
This info, may be useful, especially the incidence of neutered dogs being attractive to other males
http://www.gsdhelpline.com/castration.htm"THE RIGHT TIME FOR CASTRATION.
Castration can help alter a dog's behaviour at any age after puberty, but it is important to remember that castration will not have an overnight effect. Improvement may take several months and inappropriate learned behaviours will need to be changed using behaviour modification techniques.
CASTRATION OF YOUNG MALE DOGS.
It is becoming increasingly popular to castrate male dogs at a young age, as a preventive measure. The optimum time is just after the dog has reached puberty and started to lift his leg to urinate. This is a policy which has been employed by Guide Dogs for the Blind for many years.
WHAT ARE THE DISADVANTAGES OF CASTRATION?
In some dogs, there may be coat changes that necessitate more frequent grooming to stop the coat matting. In some short coated breeds the hair may appear to be thinner in places.
Some neutered male dogs become sexually interesting and are occasionally pestered by other males. It is believed that after castration these dogs smell like a bitch. In a survey of 98 castrated males, 23 owners reported this phenomenon immediately after neutering. One year later the figure had reduced to 14 (Palmer). "