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Question on focus speed -Tamron 70-200

Feb 21, 2013
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I have owned a Tamron 70-200 VC for about 15 months and had no problems. I mainly take photos of family activities, friends and my kids sports teams which I share with the school, sports club and other parents.
I encountered a problem when I was taking photos of our two family dogs chasing a ball being thrown by my wife. I had positioned myself so that the dogs would be running towards me -( I was going for the ears flapping type of shot ) my 5D3 was set to AF expand (9pts) at center point. AF mode in case 5(erratic movement and speed). I shot at various apertures and shutter speeds ranging from 1/1250-2000 in burst mode. the resulting pictures the dogs were blurred and I'm not really sure what went wrong. At first I thought it was motion blur, it was too much blur to be the F-stop but I went down to F7.1 just in case.
Could it have been the VC-the minimum shutter was 1/1250 so I didn't think so. Could I have just completely missed?????
I am a bit embarrassed by the result but I'll post a typical example of what i'm talking about :-[
 

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