How Much Vinegar for Dogs?

Has anyone ever heard of adding vinegar to pet's water to ward off fleas? I heard this on a PBS show, but their site is down for construction.

Apparently the pets drink the vinegar water and by it coming through their pores, it keeps fleas away. There were different amounts of vinegar based on the pets' weight. Any input would be appreciated.

By mom of towers from St. Louis, MO

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