i slice them and put them on a cookie sheet on a silpat so i get "coins" for the little dogs, but i also do whole ones for the bigger dogs. you just pop them in the oven for hours and hours at like 200. the whole ones come out looking like a piece of wood but they soften up as the dogs start chewing. be careful though as they have a ton of fiber in them, if you let you dog eat a whole sweet potato they're going to need to take a massive shit in a few hours. like bigger than you thought possible.
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