In April 2005, reports began flowing out of Maryland regarding innocent bystanders being cowed by groups of roaming bovines. These bovines were not rampaging bulls let loose on city streets (à la Pamplona), however, but humans in cow suits who traveled in vans and trucks and handed out free goodies such a bells, all emblazoned with the words "Bovine United" and/or the domain name BovineUnite.com.
The Snopes article goes on to mention that an ad on Craigslist was posted by RedPeg marketing to hire cow-suit wearers in Baltimore.
RedPeg.com didn't have anything that I could find that might shed some light on the campaign. The domain is registered to a name that does not appear on the red peg site.