Fleas are typically brought into the home by a family pet, such as a cat or dog. Fleas feed off of blood and need it to survive. If you notice reddened skin, excessive scratching, or even hair loss on a pet, this may be a flea problem. Fleas are very small, roughly 2.5mm in length, are flat, have no wings, and six legs, making them great jumpers, with capability of jumping 13 inches at a time. If fleas are not taken care of properly their population can expand rapidly, and therefore it is imperative that fleas are dealt with by professionals.