Final answer:
The symbiotic relationship between a flea and a dog is parasitism, where the flea benefits at the expense of the dog.
Step-by-step explanation:
The symbiotic relationship between a flea and a dog is an example of parasitism. In parasitism, one organism (the flea) benefits at the expense of another organism (the dog). The flea feeds on the dog's blood, causing itching, bites, and potential infection for the dog.
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