In one day, a flea can bite your dog up to 400 times and can consume 15 times its body weight in blood. In addition to extreme discomfort, fleas can also cause serious health problems for your pet.

When a flea bites your dog, it deposits a small amount of saliva in the skin. Your dog can develop Flea Allergy Dermatitis (FAD) in reaction to this saliva, which causes severe itching. In addition to your pet scratching or biting excessively around the tail, groin, or backside, scabs or bumps may also appear on your pet's neck or back.

Anemia may occur in pets if too many fleas suck their blood. The signs of anemia include pale gums, weakness, and lethargy in your pet.

Dogs may also become infected with tapeworms by ingesting an infected flea.