if your camera body is Rebal, 5D or 5DII.., it's tough to get a good shot of a running dog. i ues 7D for exsaple, set camera to Al Servo, and high burst rate, shuter speed usually faster than1/1200, depending on the light, use smaller aptrue if still can use faster shuter speed.i know some people like to manully set up their exposure, and company with Auto ISO.
when taking picture of the running dog, try to keep the focus point on dog's eyes,and take s burst of at least 5-6 shots and need a little practice. also you can compare which will make the picture sharper when IS is on or off. I personaly turn it off when shoot BIF.
faster shuter speed 9faster is better)and properly focus on the subjuct is the key to get good result.just my 2 cents.





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