Practically all veterinarians readily diagnose and treat parasitism in the dog. Such parasites as fleas, lice, ticks, tapeworms, hookworms, and ascarids, are common and are dealt with routinely and quite effectively. However, there are a great many more parasites of the dog, most of which do not receive much attention until they appear under unusual circumstances, and then are too often considered only as curiosities. This article was written for the purpose of attracting attention to a few of the less common, though far from rare, parasites of the dog which have interesting and direct importance to human hygiene, or which may appear unexpectedly at post mortem examination, causing confusion or bewilderment in the mind of the examiner.