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Use a flea comb on your pet. Wear white socks around your house. Watch your pet for behavioral changes. Check your skin for flea bites.

Article:
A flea comb is a very fine-toothed comb easily found in pet supply stores, the pet aisle in discount stores, or at a veterinary office. Work the comb down to the pet’s skin and slowly comb through the fur. If there are fleas, you'll see small black flakes or even fleas as you pull the comb through the fur. When you're at home, spend some time wearing white socks. This will make it easier to spot fleas. If you notice a bunch of tiny black spots on your socks, this may be a sign of a flea infestation. These might show up as actual fleas that may jump on your ankles and feet, or these specks may also be flea dirt. You may notice your pet scratching or furiously nibbling at itself if it's being bothered by fleas. If you have flea bites, you might have small pink and red bumps or spots which may be itchy.  You might find flea bites at the fold of a joint, such as at your elbow, knee or ankle. These bumps will turn white when you press on them.