Travis County leaders are weighing participation in a city-led tax financing plan to support decades of development in the eastern "Dog's Head," following Austin City Council's recent vote to annex the nearly 4-square-mile area. The big picture The Dog's Head covers more than 2,600 acres along the Colorado River in East Austin. With city officials' May approval of the annexation, Endeavor Real Estate Group now plans extensive mixed-use development throughout the area.