What to use to kill fruit flythat is safe for cats

insecticide that fruit  kills fruit  flies but safe for cats

Instead of using insecticides, you can make a DIY fruit fly trap that is safe around pets. There are suggestions here: http://www.apartmenttherapy.com/10-best-posts-on-getting-rid-of-fruit-flies-fruit-fly-traps-194009

Do you know where the fruit flies are coming from? Eliminating things that attract fruit flies, like produce (fruits, veggies) that is going bad, and keeping your kitchen clean will help.