The ball
The specifications of Canadian and American footballs are slightly different, and imply that on the average the Canadian football will be slightly shorter although not, as popularly believed, slightly fatter. Canadian Football League rules specify that the long circumference of the ball should be not less than 27 3/4 inches (705 mm) nor greater than 28 1/4 inches (718 mm), while the short axis should be no less than 20 7/8 inches (530 mm) nor greater than 21 1/8 inches (537 mm). The dimensions of the official National Football League and National Collegiate Athletic Association football are specified by its manufacturer as: short circumference: 20 3/4 to 21 1/4 inches (527 to 540 mm), long circumference 27 3/4 to 28 1/2 inches (705 to 724 mm).
However, since most official Canadian and American footballs are made by the same company (the exception is Arena Football League balls, which are made by Spalding, but the dimensions are the same), it is likely that their dimensions are identical. The chief difference between a CFL, NFL, NCAA, and AFL balls is the type of stripe applied (or not). Canadian balls have a complete white stripe around the football 1 inch (25 mm) from each end, NCAA balls have broken stripes, NFL balls have no stripes, and AFL balls are tan with two blue s-shaped stripes.
Look at your sig and you'll see who makes the NFL football. 
. i just noticed it was in plain view, haahaha