OK,I know Im late to the party. OP was asking how to stop action...shutter speed. For a shot of a dog running,you may want to use a shutter speed of maybe 1/500th or higher to totally freeze action. Gotta remember though,higher shutter speed = less light getting to the sensor. Also,shoot raw like others have mentioned. It gives you total control when processing your images. You should use AI Servo when tracking moving objects. Switch your focus mode to it,then focus and hold your focus button down while staying on the subject. It takes a lil practice,but becomes easy once you get the hang of it. Another thing,if you really want to get some awesome shots of your snakes,you should look into getting a speedlight. That way you have total control of flash and you can try some OCF=off camera flash. Good luck and happy shooting.
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