Artwork of Poochy from Yoshi's Island.
Series Yoshi's Island series
First game Super Mario World 2: Yoshi's Island
Created by Nintendo EAD
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Poochy(JP) is a character in the Yoshi series who first appeared in Super Mario World 2: Yoshi's Island as Yoshi's ally. Normally Yoshi wouldn't be able to cross over certain spikes in the game, though this dog-like creature was able to. So Yoshi would jump on top of Poochy's back and ride him over the spikes so that he could progress through the game.

Also notable is the fact that Poochy is virtually indestructible, and is capable of plowing through enemies without generating even a scratch.

Later on Poochy appeared in Tetris Attack where he was brainwashed by Kamek. The only way to save him was to make Yoshi battle the poor pup. Eventually he would do so, and Poochy would be saved (and would then become a playable character).

In Yoshi's Story, Poochy helped out Yoshi yet again by sniffing out certain special items. In Mario Kart: Double Dash‼ he appeared in the background of Baby Park, and in Mario Party Advance there was a gadget called Poochy Pal that just showed Poochy walking around a back yard.