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Hi. Welcome to Just Answer. My name is***** Thank you for your question. Can you post a picture of the worm? Is Zoey acting completely normal otherwise - eating well, drinking well, no vomiting or diarrhea?
That is great that she's acting normal otherwise! The most common intestinal parasite that can look like a small glob of white that moves (kind of like a flattened piece of white rice) is a tape worm. These typically are tapeworms obtained from grooming and eating a flea that had the intermediary stage of the parasite. Tapeworms aren't a life threatening situation. They are pretty common. When tape worms are present, a single dose of a praziquantel product dosed by weight will clear the current parasites in the intestinal tract. They have to have flea control to prevent re-infestation.
Here is a good link on tape worms.