We have prairie rattlers here. I get them in my yard so have the opportunity to see them close up more than I care to. Heres a link with a sound effect if your not sure. Its a pretty distinctive sound once you've heard it you won't forget
If your horse is bitten near the nose/mouth the main thing is to keep the airway open when it starts to swell. Heres a link with some helpful info http://www.horses-and-horse-informat...eptilian.shtml
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