I think that although the man may not be convicted of a felony of extortion in law, his harassment or intimidation may bring shock or even depression to the original owner. Therefore, if the original owner brings a lawsuit to the court, even if the man is not convicted of a felony, he will still apologize to the original owner and demand compensation and other due punishment.
From a moral point of view, since the man is an adopted cat, it is a free adoption, and the cat itself is given to him for free. Generally, the original owner's pet cat is usually bought by the original owner from a pet shop at a lot of money. Because of unnatural factors such as moving and lack of time, he wants to send the cat to the so-called? Cat adoption office? When you adopt a cat, you usually sign an agreement. In the agreement, it is generally written that if the cat is sick or unable to raise it, it should be sent back to the place where the cat was originally adopted, which has legal benefits. It is also shameful not to keep promises. Of course, the adoption agency also has the right to take back the cat so that he can't continue to harass or even blackmail the original owner of the cat. The original owner of the cat can also apply to the court for enforcement.
The reason why the man blackmailed the original owner can also be investigated. If it is due to factors such as insufficient cat supplies or illness of the cat, he can apply for returning the cat directly and refuse him to adopt the cat again. If the cat is very good and deliberately seeks blackmail for no reason, it is recommended to call the police directly.