It’s getting interesting, punters. With vital clashes across the board, there’s no room for error, starting with the Dogs looking for a top eight spot against the Giants, the premiership faves and reigning premiers going toe-to-toe, and the Crows and Hawks fighting for the four. We’ve put together all our tips analysis ahead of a massive round of footy in the AFL Round 21 Preview.   Western Bulldogs vs GWS Giants Thursday 31 July, 7:30pm, Marvel Stadium GWS Giants (+15.5) To Cover @ $1.90 After weeks of primetime disappointment from the AFL fixturing gods, we finally have something to look forward…