How to create cutpet’s material???
I reckon you mean “carpet”? 
In that regard, you can either also use one of our rugs which are available in the Asset Library, or make use of some short Grass actually which you can color with a dedicated carpet texture (Albedo). The results are usually very decent!
Oh~NO!!!
I mean is carpet~~hahaha.
I tried using “grass”, but it’s to big & tall, even if it is already the smallest.
I see! 
Okay, thanks a lot for your feedback - in that regard I will happily forward your upvote to our “Carpet and Fur material” request on our agenda. 
Still, in case you have a moment you can also gladly send in a screenshot of how it looks like in your scene? I’m mostly just curios, maybe there is still something one can do to improve this depending on the context of the scene.