A. The "black pepper remnants" are likely flea dirt, digested blood. Treat the dog monthly for at least 3 consecutive months, preferably year round. The environment must also be treated. Vacuum everywhere the dog has been. Discard the vacuum bag outdoors immediately afterwards. Wash all bedding that has come in contact with your dog in the hottest water temperature allowable. Use an area treatment such as Knockout ES afterwards. Inspect your dog daily and use a quick kill product such as CapStar if you see adult fleas between treatments.
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