A story about a skinned animal/fur coat in a closet with a bone in it's tail, gained more bones by the character feeding it fruit from a tree

First of all, I'm not quite sure if I'm putting this in the right section, I'm fairly new to stack exchange and I couldn't find anywhere else. I'm sorry if this isn't the right category.

This was a book that was read to me about 6 years ago in school, I can't remember the author, the book name, not even the character name.. But what I do remember is the character found a skinned animal/fur coat in a closet and there was a bone at the end of the tail. The fox spoke to the character and said to put a fruit from a tree in it's mouth and every next day, the character would find more and more bones in the tail and through the body, etc. That's all I can remember.

If anyone has an idea of what book it may be, please let me know and thanks in advance.