Our advice Home page > Our advice > Fleas Bedbugs Fleas Moth Silverfish Ants Fleas Recognising and treating an infestation of fleas Are your dogs and cats constantly scratching? Do you have bites that are extremely itchy? You probab... What you need to know about fleas: biology, behaviour and risks Fleas are small insects that feed mainly on the blood of dogs and cats. Biological characteristics, ...