The Big Dog House Slot by Pragmatic Play

This is a brand extension in Pragmatic Play's kennel franchise, sitting somewhere between the original Dog House and the larger-format Megaways version. Same cartoon backyard, same roster of breeds framed in pink paw-print panels, but the mechanic on top of the 20-line base is where things get specific: the wild reels (2, 3, 4) now spawn wilds at three different sizes - a regular 1x1, an EXPANDED 1x3 stripe, or a full 3x3 COLOSSAL block that covers the entire middle of the grid.

Every wild arrives with a 2x or 3x multiplier. The interaction rule matters here: when two wilds land on the same payline, the multipliers add rather than multiply. Two 3x wilds give you 6x on that line, not 9x. It sounds small but it changes how you read near-wins during base play.

Free Spins trigger on 3 red BONUS symbols across reels 1, 3 and 5, and the spin count comes from a 3x3 reveal grid where each cell shows 1, 2 or 3. Sum all nine and you get the total - a theoretical 27 if every cell rolls a three. Inside the round, wilds lock as 1x1 stickies on reels 2/3/4 and keep their multiplier for the duration. Reel 5 gets a GHOST WILD that substitutes at 2x or 3x but also unsticks a random wild from the grid on the following spin, so the bonus becomes a back-and-forth between building your sticky stack and losing pieces of it.

Two modifiers can attach to the round. BIGGIE forces every wild to land as the 1x3 expanded strip. GHOST OUT kills the wild-removal mechanic by banning the GHOST WILD from reel 5 entirely. The four ante bet levels (40x, 40x, 80x, 120x) each boost the odds of triggering a specific modifier combination, with the 120x tier targeting BIGGIE + GHOST OUT together. Buy Bonus shortcuts the same ladder: 100x for plain Free Spins, 200x for either single modifier, 500x for both stacked.

Super Spins sit in their own tab and work differently - they guarantee wild types on every base spin (at least one EXPANDED at 100x, up to a guaranteed COLOSSAL at 4000x) but disable the Free Spins trigger completely. Pure base-game grinding at escalating cost. For a franchise that started with a straightforward sticky-wild bonus, this one packs in a lot of switches to pull before you even press spin.