Adult hookworms and roundworms in dogs and puppies can look alike when viewed by the naked eye. Both are white spaghetti-shaped worms, but can have different lengths. Although there are several species of roundworms and tapeworms, the adults look alike.
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Identification
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Both dead adult roundworms and hookworms can pass out of the dog's feces. But other symptoms of hookworm or roundworm infestation include anemia, diarrhea and weight loss.
Significance
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Knowing what type of worm the dog has is necessary in order to give the right medication. According to Dr. Holly Nash, editor of PetEducation.com, some medications effective for killing roundworms, such as piperazine, will only kill roundworms but not hookworms.
Size
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"Dog Owner's Home Veterinary Handbook" reports that hookworms are about a half-inch long. Roundworms can grow to be 7 inches, but can die and be passed out when they are only a half-inch.
Eggs
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Under a microscope, eggs are found more often than adult worms. The eggs of both species of canine worms are microscopic and pass out in the dog's stools.
Difference
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Mar Vista Animal Medical Center states that adult roundworms can be vomited up, especially by puppies. Hookworms cannot because they do not infect the stomach.
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