My cat who died a couple of years ago at the age of 16 had a bell on his collar all his life. I couldn't pick that bell up without it tinkling but Radar could walk from one end of the house to the other, including the stairs, without a sound. Also when hunting he did most of it by waiting for his prey to get close enough so that any noise from the bell was simply the last sound they heard.

For a while he used to sit on the roof and catch bats