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They squeal when my dogs chase after them out of the yard. You wouldn't know it by looking at them, but those suckers are as fast as rats!

Yes, they are really fast!

The "shell" is hard, but not as hard as a turtles.
They do have hair/fur, and they are a mammal.
They can make a noise, but I do not recall what it sounded like.
I think that the tail, belly, and claws make them look similar to a snapping turtle.