In common with all dogs, my Czechoslovakian Wolf Dog loves eating its own vomit. Is it okay to let him eat strangers' vomit off the sidewalk?

Sometimes we go into town (I say town, it's really a village of about 80 people who work with sheep) on a Saturday or Sunday night around the time the pubs are emptying, and wait for drunks to chunder before eating it. We always sniff it very thoroughly first.
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