MY SECRET ANIMAL

It belongs to the family of marsupials.
It eats small animals and dead animals, too.
It has got a strong mouth and its teeth are very sharp.
It weighs about 8 kilos.
It lives for about 7 or 8 years.
Its body is small, black and very strong.
This animal is very dangerous but very small.
It’s very aggressive.
Its looks like a small dog, a small aggressive dog.
It’s not an angel!!!!!
It lives at forest of Island Tasmania (Australia).
What animal is it????