Fleas and other parasites have always to be awarded the top priority by dog owners. The all too common occurrences of flea bite allergy in dogs causes concern to many dog owners every year, especially in the summer. This is because flea bites often cause allergic reactions in the area bitten by the fleas, which is often on the back above the tail. In these cases, the affected skin becomes hairless due to the dog scratching itself very vigorously.