Originally Posted by Zeke
I've seen this before and am pretty sure it's a genetic disorder that can occur in other animals as well. If that's true then yes, it can be bred for. I'm sure it has something to do with abnormal testosterone levels.
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Yes there is a disorder that causes uncontrolled growth of the muscles, which is the case here. I can't think of the name of it. Yes this completely could be the product of selective breeding for that specific defect.