The final curious fact about a dog's vision is that their visual actuity is sufficient to resolve the European transmission frequency of 625 dots per second into a visual image. American television transmits at 525 dots per second, not quite fast enough for the canine eye to see anything other than a screen full of fast moving dots.
-- The Dog's Mind by Bruce Fogle, page 35.
-- The Dog's Mind by Bruce Fogle, page 35.