how long does cat skin take to decompose?

So i buried my cat about i think a year ago. He wasnt very big. Maybe a foot and a half long including his tail. I want to start collecting animal skulls. Is his skin decomposed yet? Also i burried some newborn kittens about 6 or 7 months ago. Same with a small pet mouse. I live in tennesee so its cold in the winter,hot in the summer. And the animals except the cat were wrapped in a shirt and in a box



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