I like the use of humor in this photo (completely appropriate for these speed challenges).
The colors and contrast are very striking. The lighting seems a little harsh or maybe the photo is oversharpened - but I'm not sure that bothers me as it seems to be more of a style for the photo.
I like the composition and the overall framing of the shot. Nice work.
Dobies are the BEST! I've had two. They can show such intensity when they want/need to! How long did it take you to get this? Did he/she think it was a treat? Great shot!
:) Love this image, love the title. But there are no tacks in this image. ;) The dog seems over sharpened a bit but is cool he let oyu do that to him. And I love the title. :) 7 for now, may bump later.
Boy am I scared! Cute idea. Nicely framed. Good choice of bright light, short focal length lens. Although the dog's face more than fills the frame, I am left with a sense of emptiness here. Somehow the dog - in his choice of expression - has subverted the photographer's intent and has become the background, and suddenly the tack is too small. That's just what I see.
As I'm sure everyone will tell you, this image is over-sharpened, but it's a really cool shot nonetheless. Nice point of focus (har!) and really good setup. Very well done.