Flea allergies seem to fall into a category all their own. Mainly
because you can easily resolve the problem by getting rid of the
fleas. While our pets scratch and react to the fleas themselves,
if they have a flea allergy they usually are sensitive to the saliva
of the flea’s bite. So when they receive even one bite from one
flea, they become extremely irritated. Sometimes we are not able
to see any fleas so you have to be a bit of a detective.