Smith Pest Control have successfully treated thousands of Flea infestations. The most common sign of a problem by far is their irritating bites. Fleas only jump around 1-2 ft off the ground. Therefore bites are usually around the ankles and lower leg, unless they have infested a couch or bed then bites can be anywhere.
These insects can live without food for several months and are naturally unable to lay eggs until they have a blood feed (from a cat or dog). They often live in carpets, pet bedding and other cracks and crevices around the house.