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How can the crystal foxes in "The last Jedi" be living?

They're made of minerals and crystals as far as we can see, so what holds them together. Is it the Force?

The very short answer is that the outer "fur" of the Vulptex is crystalline, but the inner part of the animal seems to be mere flesh and blood. The film's
Visual Dictionary indicates that over time the animals have evolved to take advantage of their surroundings (and abundance of crystal salts) but there's no good indication that their physiology defies logic, any more than a snail does because it has an integument made from metal.

But no, it wasn’t his imagination. There really were animals back there—dozens of them. They were small—not much higher than a person’s knee, with long, pointy ears and drooping whiskers framing their faces. Their bodies glittered in the transports’ lights, and Poe realized what he’d thought was fur was actually a dense covering of crystal bristles. When the creatures moved, their fur made a sound that reminded him of the wind chimes of distant Pamarthe.

_{^{The Last Jedi - Official Novelisation}}

I don't know the canonical answer, but flesh-and-blood creatures can have crystals growing off of their fur.

This is an image of a furry animal with dihydrogen oxide crystals growing off of its fur:

It lives on a planet with where it rains both liquid and crystal dihydrogen oxide, depending on temperature.