Thanks for that Jenny, interesting reading. My last dog (greyhound) did develop testicular cancer but was then castrated, vet said its not a rapid growing cancer so caught early he made a full recovery, I had no reason to castrate him as he was so mellow and not interested in the ladies or fighting.
Weller Made the decision for me when at 15 months he started taking off after girls, although I do think that many people walk their in season bitches as normal and so couldn't really blame him for that.
It was the fact that he would switch his hearing off and so I would have to go and chase after him, bring him back only for him to take off again. He hasn't done this since being castrated. I definately had no reason temperament wise to give him the chop as he isn't a dominant type of dog. My vet is also on the non castration side of the fence, the first I know of!!