Arabic proverb?

"One woman from Syria who braved the government’s wrath to attend the meeting evoked an Arabic expression to note that the opposition inside the country was already moving beyond them. “The dogs bark,” she said “But the caravan moves on.”"  Now, I have seen this once before cited in the Western press as an Arabic proverb.  Arabs do refer to it in modern times.  But I very much doubt that this is an Arabic proverb.  It sounds more like a translation of a Western saying. By the way, is there not a similar saying in one of Shakespeare's plays?