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How to tell if your dog has fleas 
Watch your dog for excessive scratching or chewing. 
Flea bites are extremely itchy, so the first sign of a flea infestation is usually seeing your dog scratching or chewing itself more than usual. 
Other behavioral signs of fleas might include head shaking, hair loss, scabs, or hot spots.
Examine your dog's skin for tiny, red, raised bumps. Are usually smaller than other insect bites.