Thirsty Dog Brewing Co. in Akron is graduating. The brewery, which has been growing steadily since setting up shop on Grant Street, is no longer considered a microbrewery -- at least according to the Association's definition. Thanks to the fact that Thirsty Dog will soon be able to produce more than 15,000 barrels a year, the brewery is considered a "regional brewery." Microbreweries make less than 15,000 barrels, while regional breweries produce between 15,000 and 6 million barrels. The brewery is adding six 90-barrel fermentation tanks and a 90-barrel brite tank. The first three tanks are arriving this week. "It makes it all more exciting and fun," co-owner John Najeway said. "It's amazing that in 2007 we brewed 1,000 barrels that first half of the year, and a couple thousand barrels in 2008. With this expansion, we're just under 20,000-barrel capacity in four years. It's huge growth. And that growth is due to being in Akron. That's where our biggest growth has been and we're sorta Akron's beer now." Thirsty Dog is the fifth-largest brewer in Ohio, behind Anheuser-Busch InBev, MillerCoors, Samuel Adams and Great Lakes.