Cats can eat hairtail, but there is a chance that the spines will get stuck. However, cats have the unique skill of spitting out the fish bones, so owners don’t have to worry. Cats' favorite food is fish. When they eat it, they will filter out the fish bones or chew them into pieces. Cats' tongues can pick out the fish bones. Even if they swallow the fish bones, cats have unique muscles that can spit them out.