I generally shoot performance dogs with a very high shutter speed. They are just going too fast to catch them with anything slower than about 1/1000 of a second. Pictures generally come out tack sharp showing all the details you missed because they happened so fast you didn't see them. Once in awhile I like to add a little motion back into the picture. Rather than pan with a slower shutter speed I find it easier to add it in after with a little help from photoshop. Here's one I did of Cider. A wonderfully fast golden owned by Bill Gates. You can just feel how fast she's taking the jump!
