If you need dowels, it must be an awfully large smash cake! They are usually very small.
I've only ever done small, 5" or 6", single-tier smash cakes. No dowels needed. But even if you do want to do a two-tier cake, I would guess that they would still be very small, probably 3" or 4" top-tier and 5" or 6" bottom. I would probably still forego the dowels and just stack the tiers. They're not heavy and the bottom tier isn't supporting a ton of weight, and the kid is just going to destroy it anyway. I wouldn't want dowels or cake rounds getting in the way of the smashing.
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