Black particles on the dog may be fleas. The owner should deworm the dog in time. Pay attention to the hygiene of the dog's living environment and clean the items used by the dog regularly to prevent the occurrence of bacteria, fungi and parasites. If your dog has too many fleas, you can take your dog to a pet hospital and ask professionals to handle it. During the deworming period, parasites will fall from your dog's body, so you need to clean them in time to prevent your dog from accidentally eating them.