According to the Trib. this AM, 86,000 people are injured by their pets each year, many tripping over them.
45,000 bicyclist are injured every year according to http://bicycleuniverse.info/transpo/almanac-safety.html
(scroll down to Non Fatal Injuries)
*Ah, statistics, MASSIVE DISCLAIMER: of course this doesn't work as a direct comparison, I suspect many more people own pets than bike regularly (what are the injuries per million miles of pet usage?), and then there's the sub-set of bicyclists who are pet owners and how often they get injured by a. there bike, b. their pet.
But, it does make you think a little.