Every quarter the greyhound adoption group that we got our hounds from holds a dog-wash fundraiser. Last weekend I went to see people bring their hounds to get bathed, nails trimmed, ears cleaned, and just fussed over.
I used my 10-24mm zoom for quite a few shots, trying to get close enough to fill the viewfinder. But I also wanted to use the 50mm for some informal portraits. Here are some examples, with the aperture set to f/2 or f/2.5 (to blur the backgrounds) and the D300 set on aperture-priority:
Here are a couple of examples using the 10-24mm:
When I think I'm close enough to my subject with this lens, I have to force myself to get closer. For me using an ultra-wide-angle lens means getting in close enough to make you feel like you're standing next to the subject, not for getting everything in.
I don't think I used the 18-200mm once. Also, while I had an SB-800 flash mounted, I used it when there were some deep shadows that needed a little filling. But with wet, sunlit black dogs I don't recommend using flash at all on them: they come out too shiny.
Finally, one last shot using the 50mm:
There used to be a greyhound there.
(Shot with the Nikon D300, the 10-24mm zoom, and 50mm lens; SB-800 flash; normal JPG.)