Quote Originally Posted by OliveOil_Med
So what could have been some possible reactions if Hermione has used fresh cat hairs? Under what circumstances could a person get as close to an animal tranformation with the Polyjuice Potion?

Do you think it could be possible for a Polyjuice Potion to be altered so it could be used for temporary animal transformations?
Well, we know animal transformations are possible. Moody/Crouch turned Draco into a ferret. So it's conceivable there is a potion that can do the same thing. It's probably something similar to Polyjuice Potion, but I doubt it's simply making Polyjuice Potion with animal hair instead of human hair.

I also suspect it's a lot more dangerous, kind of like becoming an Animorphmagus. See my earlier post; if you drink a potion that suddenly turns you into a cat or a ferret or a bird, you're going to be in a body that you have no idea how to control. And it's possible that becoming an animal could have other side effects that make the whole thing more dangerous.