How often will the bonus round come?
3 BONUS symbols on reels 1, 3 and 5 start the Free Spins, yet no one can tell in advance how often that happens. Each session is a run of random outcomes. Some sessions end without a bonus, others bring several. The RTP of 96.51 describes the return over a long series of rounds, not the outcome of a single visit.
96.51 is the only RTP version listed for The Dog House on this page. Which version is running here is shown only in the game rules, so read them before the first stake. The rules name the version in play, and the figure on this page cannot replace them.
x6,750 is the highest multiple of the bet the game can pay, a ceiling that players reach very rarely. Reaching it depends on the feature outcomes of one round, and no session is guaranteed to get close. Treat the figure as the upper limit of the game, not as a typical result.