@TVRTim Sadly it wasn't my dog - there were two of them, and you know how the minute you crouch down, they come running at you? I did think I might get flattened
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I think it may have been a samoyed.
I was thinking some more on this. The 12-40 is a bit short for getting shots of dogs really - except for wider, in the environment type shots, or close up still ones. I also have the 40-150 f/2.8 (as
@moggi1964 uses) and that would be my preferred choice for a running dog, especially a lively springer. You can also add an extender to give you bit more reach. The 1.4 extender works very well on this lens. There is also an f/4 version, but I have a feeling that won't take the extender.
The trouble is you are then looking at changing lenses, so for me the 12-100 is a great compromise, and I would rarely take the 40-150mm with me on a walk - but that's me. The 12-100 won't take an extender which is a shame.