Riddle for a cookie #4

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Answer this riddle right and you get a best response and a cyber-cookie: flavor is randomly chosen. FOUR LEGS HAVE I, A STURDY FELLOW A FUZZY BACK THAT ISNT YELLOW BUT OFTEN GREEN OR RARELY RED A DEN IS WHERE I MAKE MY BED MY KEEPERS FEED ME COLORED BALLS WITH STICKS THEY STORE ON MY DEN WALLS SOMETIMES I STORE THEM IN MY POUCH SOMETIMES DEEP IN MY BELLY, OUCH! THATS WHEN YOU WILL SEE ME ACTING STRANGE INSTEAD OF BALLS, I EAT CHANGE AND THATS MY CUE TO FEED AGAIN CHALK IT UP TO HUNGER, MY FRIEND! Many clues in here...have fun!