Flea and Flea Allergies
Flea bite allergy is the most common allergy affecting dogs.
In spite of common belief, a normal dog experiences only minor skin irritation in response to flea bites. Even in the presence of dozens of fleas, there will be very little itching. On the other hand, the flea-allergic dog has a severe, itch-producing reaction to flea bites. This occurs because the dog develops an allergic response to flea saliva.