Typically, a Dummy hand is dealt like any other, typically to the left of the dealer (the first player). the Dummy hand never bets, nor needs to match any bet - it is always in. Progressive deals continue to deal the Dummy hand in.
As an added twist, at the end of the hand if the Dummy hand beats the highest hand of any true player, then the hand is redealt among all players who remained in the game to the end, and they must re-ante.