http://www.tincher.to/deaths.htmAverage number of U.S. child hyperthermia fatalities per year since 1998: 37
http://ggweather.com/heat/"Last year there were a total of at least 33 such fatalities in the United States due to hyperthermia after they were left in hot cars, trucks, vans and SUV's. Since 1998 there have been at least a total of 445 of these needless tragedies. "
OK, ok, ok, just pulling up some quick links, not going to argue guns/cars, just comparing to the quoted "17 deaths/yr by dog" thing.