Internal parasites -- Heartworms, canine -- Heartworms, feline -- Hookworms -- Whipworms -- Roundworms -- Dipylidium tapeworms -- Taenia tapeworms -- Giardia -- External parasites -- Fleas -- American dog ticks -- Brown dog ticks -- Deer ticks -- Common ticks compared -- Ear mites -- Demodex mites -- Cheyletiella mites -- Sarcoptes mites -- Internal organs (canine & feline) -- Under the microscope -- Photographic aids to identifying common parasites and pseudoparasites as seen in blood, feces, and urine.