
Hi Chas, I'm not a Boxer owner either, but this is a fairly general subject and you asked for oppinions. Mine is in agreement with the other two. Unless you also own bitches, I would not feel any need to castrate at all. Then again although I do not agree with unneccessary surgical intervention of any kind, there are said to be certain health benefits to spaying bitches, so I'd rather do that than castrate a dog.
If you were to register with Champdogs (it's free) then you could come back on here and discuss this and help us to understand your circumstances. That way our advice would be more in tune.
Dawn R.