I've had a run-in, in March, and it really shocked me. Dog came out of a farmhouse yard, ran up, bit me and ran back into his house. We were on our way to see a local bike builder at the time and he told me when we returned to get our bikes a couple weeks ago that the dog has since developed a habit of chasing bikes and has bit a couple other people but the owners don't care.

Ever since then I've been skittish about dogs but I don't know if there's a solution really. Pepper spray has to hit the eyes to be effective, kicking or grabbing your pump to hit the dog while driving is dangerous to you, you can't out-cycle them. The best solution I can see is to stop and use your bike as a barrier.