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Internal parasites can reside in your dog's body and cause illness. Some, like roundworms can be visible to the naked eye in your dog's stool. Others, like whipworms must be detected under a microscope. Your dog's annual veterinary exam should include a stool sample and this will determine whether your dog needs a deworming.
If you have concern that your dog may get roundworms, he can take a monthly heartworm medication as a preventative measure.