A vacant commercial property at 110 Mill Plain Road in Danbury has been approved for retail renovation and may soon become a dog day care. The site, featuring two barn-like buildings near the Interstate 84 Exit 2 interchange, had previously been eyed for a Dunkin’ Donuts drive-thru but was denied. Renovations are expected to cost about $50,000. No opening date has been announced. The area is part of ongoing redevelopment along the busy Mill Plain Road corridor.