Velcro Zipper
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There's this guy if you can find one, but you might also consider finding two separate minis. The player can use the wolf mini to represent when he is mounted and both minis for when he dismounts. If money is an issue, maybe get a prepainted plastic wolf and then spend on the metal halfling.
Alternately, I use a metal Reaper gnome mini for a cavalier I play and a homemade tile of a pony for her mount. That way, I can place my gnome's figure on top of the tile when she's mounted and then remove her when she dismounts.