To make your Chao LOOK like a wolf you'll need to give it the Raccoon for ears, Otter for whiskers, Cheetah or Tiger for claws & the Unicorn or Condor for a Tail.
The animal parts will grow bigger & change color while raising it,
Spoiler:
Edit:^ I just realized that the Phoenix forhead feathers look wolf-like so y'all could keep your Chao's natural ears & replace the Raccoon ears with that so you don't have to go through all that trouble.
To make your Chao ACT like a wolf give it the Peacock, so it will strut, Warthog so it will dash, Seal so it will roll around & the Phoenix so it'll wag its tail.
To make sure your Chao always acts like a wolf with it's costume on, give it aton of the animals that makes it act like one before putting on it's wolfy costume; then after it has it on observe it's behaviours & if it doesn't act like a wolf all of the time replace the animal parts that you saw it acted as with the ones it needs to act as then put the wolfy costume back on. (repeat this process until it always acts like a wolf with it's costume on.)