easy

You can tumble in it, Roll in it, Burn it, Animals eat it, Used to cover floors, Still used beyond stall doors. Freshens whatever it is placed on, Absorbs whatever is poured into it. What is it?
Common Wrong Answers
“Grass”
While grass can be tumbled and rolled, it is not typically burned or used to cover floors, and it doesn't have the same absorptive properties as hay.
“Straw”
Straw shares some similarities with hay but is not typically used to cover floors in the same way, nor does it provide the same freshening qualities.
“Wood chips”
Wood chips can be used to cover floors and absorb liquids, but they are not something that animals typically eat or burn in the same context as hay.