Flea Bite Dermatitis
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Flea bite dermatitis is caused by a hypersensitivity to the saliva of the common flea. Dogs that are allergic to the flea's saliva have incredibly severe reactions to the flea bites and can actually bite at their skin or scratch until they have open lesions and infections of the skin. Hair loss is also common when the dog becomes obsessed with licking and scratching at this incredibly itchy spots on their skin.
Flea bite dermatitis is typically most noted in the spring and fall when flea activity is at its peak. During these months even dogs that are treated with monthly flea applications will still be bitten by adult fleas, leading to the reaction. Unlike some allergens the 15 different possible compounds in the fleas saliva that a dog can react to do not seem to decrease in effect with exposure. Dogs that are sensitive will remain just as sensitive or become worse, not better, as they age. [...]
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Dogs are much more fortunate that humans when it comes to natural defenses against mosquitoes and other types of biting insects. Their coat, even if it is only short, acts as a natural barrier between the insect and the dog's skin. Dogs with very thick, heavy double coats are largely very protected from mosquitoes and biting insects, however the areas that are exposed such as the lower abdomen, the nose and even the eyes and lips can all be stung and bit, resulting in severe reactions in some dogs. [...]