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Perhaps your Dad was thinking of [shoat](http://www.thefreedictionary.com/shoat)?
I think OP’s title works descriptively. The little fellow in the picture does indeed look very determined and resolute.
Also, while we’re on the subject of suidine mustelids, [this](http://www.youtube.com/watch?v=tm7wQ_J6XzA&hd=1).