My only concern about cats be required to be licensed is they will have to wear a collar and this can put a cat a great risk . A cat could very easily get caught on a tree branch or a wire fence when going under it. I agree a well fed cat will still want to hunt for birds and mice. I have a neighbor that let their cat out and he come into our yard to hunt of mice and I have found dead a few times and they have not been eaten . A cat can live in a house and be very happy as long as it has a climbing tower and toys to play with. and I read the article . There are some cites in my state that be required cats to be licensed.