Was riding in a group at a good clip, the Lab ran out onto the road to do a quick meet-and-greet, and I managed to meet this abrupt challenge "head on". My wheel hit the dog's shoulder, he and I went down. The fork was visibly bent backwards where the blades braze into the crown. I straightened it by hand as best I could, apparently not enough or evenly enough. Could not tell you if the steerer tube was also bent, it might have been, (and might that have restricted headset movement?). The bike did not previously shimmy.

Back then (late 70's) you couldn't just google Sheldon, Jobst, or John Allen to see what to do. All we had was graduation from O'Hardknocks School, then it was on to advanced study (majoring in Trial and Error) at Fork U. oh, sorry, just couldn't resist.

Afterwards the Labrador's owner called it back to its house, but you're right, I really don't know (to this day) if the poor dog was truly all right, i.e. had no internal injuries or broken bones. But at least he seemed to run OK, no shimmy.