In males who are castrated early (this is seen in horses, dogs, and human eunuchs too), their growth plates don't close until later so they grow taller, leggier. This is a documented effect of lack of testosterone during growth. I prefer the thicker cobby look of a later-neutered male, personally.What is the difference in body structure?
I haven't found any problems with waiting til 8 months to neuter males. They don't usually start spraying until 10 months or so. And, of course, as long as they aren't around unspayed females over 4 months, because it's hard to know when they become fertile.
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