Wow you got lucky. The copperhead and cottonmouth are almost the same snake, they can even interbreed although rare. There is a video circulating of a CH and CM fighting over a female.
CMs are more aggressive while CH will not bite unless you touch them most of the time. My dog Jack was bitten last year by a beautiful CH who ended up with a 9mm to the head. Prednisone and Benadryl and he was fine in a few days.
CHs typically don’t do a full boogie bite the first time, it’s dogs that grab em and hold on that usually die because the snake decides to bite again with a full load.
CMs usually give you the business first bite, you should have played powerball that day.
Here was mr. dogbiter pre-9mm
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Be kinda easy to make the wrong step on that fella They have Camo down to a science.