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How can my puppy/kitten have worms? How was he/she exposed?

Almost all puppies are born with intestinal parasites, which are passed from mother to pup during pregnancy. Although kittens are not infected when they’re born, they can become infected through their mother’s milk. Puppies can also become infected while they’re nursing.

Testing the stool for parasites will determine what type of parasite your puppy or kitten has. Deworming may be required more than once and should be continued until a negative test has been found. Picking up your puppy’s stool will help prevent re-contamination.