Adult fleas are approximately 2.5 mm long and are dark in color, ranging from brown to reddish brown. Fleas are wingless, although they are capable of jumping large distances from host to host as a result of their six long legs. Individual fleas are difficult to kill by hand and typically require chemical treatment.
The bodies of fleas are thin and flat, allowing for easy movement through an animal’s fur. Their bodies are also covered in hair that serves to root them to the host. Adults have mouthparts which are used to extract the host’s blood.
Fleas are commonly visible moving in infested pet’s fur. Their presence may be marked by reddened skin.