As such, there are no specific bonuses created just for Dota 2 betting. However, there are some Dota 2 betting sites that have special bonuses or promotions for esports bets in general. There can also be some event-specific bonuses that are available for a limited time but can be claimed while the offer is ongoing.
Some Dota 2 betting sites with esports bonuses are 1xBet, and Megapari.