We had a Golden Lab called Pavlov who we tried to teach to ride on the bike. He was pretty useless at it as he would see a rabbit and jump off to chase them, barrel-rolling onto the roadside at 40mph.
We fitted a sidecar onto the Triumph for him, which he liked much more. The trouble was, while wearing his flying goggles, he liked to let his tongue dangle out of the side of his mouth, covering the pillion with slobber!!!!! YUCK