Otters are wild animals. Not domestic dogs with cute whiskers. They have been living in rivers and oceans for millions of years.
Their instincts are sharp. Their teeth are sharper. Those chompers can crush a clam shell—and your fingers won’t stand a chance.
In many places, it’s illegal to own one. The U.S., UK, and most of Europe say a hard "no." You’d need a zoo license. And a lawyer.