According to Tim Pennings, dogs calculate the fastest way to retrieve a thrown stick using some form of canine calculus before they even start running. Seems Zim only *looks* dumb.

!/files/zim-calculus.png!

“Thus,” he adds, “in swimming to shore he was not acting to minimize his distance to the stick as quickly as possible. Instead he did in fact apparently make a ‘global’ decision form the outset as to what path would get him to the stick most quickly.”

http://www.sciencenews.org/articles/20060218/mathtrek.asp