Fleas are the most common pests on our pets. The immature stages (larvae, pupae) can survive for a long time in crevices, sofas, dog beds and carpets, just waiting for the right circumstances (e.g. heat, humidity) to hatch and cause mayhem. Then they not only irritate our pets but can also cause discomfort in humans. Many people will tell you that getting rid of a flea infestation in your home can be quite difficult and costly.