Are you trying to raise your pet's IQ? From toys for instinctive cats [1] to other problem solvers like the popular Kong [2], making your furry friend work for his toys and treats can not only entertain him longer, but help develop doggie intelligence. These toys involve pulling, prodding, and puzzle solving – and most come in various sizes from junior to jumbo to make sure the "prey" is the right size for your pooch's chompers. See the whole set when you .