I have rarely had a hairball with my longhaired Mimi, who is an expert groomer herself! But, I find that she only throws them up when I go away and leave her for a few days. She has had the occasional night or two alone in the house, without anyone, back when I used to board my dogs (and BB...before Butter). She would always leave me a nice hairball glob somewhere conspicuous. Yuck!!!

We don't use any hairball treatment. I guess it isn't necessary if you're not having a problem, right?