Hamsters can suffer from fleas. Although this does not happen often. Fleas are tiny parasites that feed on blood. Fleas do not only cause itching and therefore skin complaints and irritation in a hamster. Large amounts of fleas on a hamster can lead to anemia. In fact, hamsters may be allergic to flea saliva, which can cause them to develop serious skin conditions. It is therefore very important to fight the fleas as well as possible.