I received lately with my food order for my four years old cat Sombra a package of "Cat Delicious Hair BallControl" treats. Sombra is brushed every morning, she is shorthaired and has never had any hairball problems. I have let her taste these treats and she loved them but before giving them to her on a regular basis I would appreciate some opinions on the safety of letting her eat a hairball control product she doesn't need. The package indicates to give her 10 to 20 kibbles a day.