[header] How to tell if your dog has fleas [title] Watch your dog for excessive scratching or chewing. [step] 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. [substeps] Other behavioral signs of fleas might include head shaking, hair loss, scabs, or hot spots. 
[title] Examine your dog's skin for tiny, red, raised bumps. [step] Are usually smaller than other insect bites.