Excessive scratching or biting at the skin
Frequent licking, especially around the legs, belly, or tail base
Restlessness or trouble settling down
Small black specks in the coat or on bedding
Flea dirt that turns reddish-brown when wet
Visible tiny brown insects moving through the fur
Hair loss or thinning coat from scratching
Red, irritated, or inflamed skin
Scabs or sores from repeated scratching
Pale gums in severe infestations
Tapeworm segments in stool or around the anus
Flea eggs or debris found with a flea comb
Increased scratching after being outdoors or around other animals