Fleas are wingless insects that are laterally flattened so can move rapidly through hair and fur. They are of major significance to veterinary practice and will be seen almost on a daily basis at most general practices.
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Adult fleas are blood sucking ectoparasites which can cause pruritis, annoyance and anaemia if present in large numbers. [[Skin Immunologic - Pathology#Flea bite hypersensitivity|Flea allergic dermatitis]] can also occur where the animal becomes allergic to the antigens in the flea saliva triggering a hypersensitivity reaction when the flea bites.
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Fleas can also act as intermediate hosts and vectors.