Good questions from a responsible dog person! In my experience Doggles offered minimal protection and often shifted out of position. With Barley (55000 miles in a sidecar) we had an agreement that if he remained behind the windscreen he didn't have to wear the Doggles. With Tulliver I upgraded to RexSpecs. They proved to be much more comfy and on our recent 7000 mile trip (VT to UT and CO and back) he never once tried to remove them. The lenses, even the clear lenses, have great UV protection in addition to wind-borne hazards. Wind noise was a concern. I put my iphone in the hack with a decibel meter app to check that out. When cruising at my normal speeds it recorded 55-65 dBA, not in the hazardous range for humans. (No data for dogs.) The only time it went above 90 was at full throttle and that was only occasionally. I worry about big ears flapping in the wind, though. When Tulliver sticks his head outside the windshield for long periods I've found that a doo-rag keeps the ear flaps in place rather well, and the RexSpecs help keep it in place.