Our kitties have been wearing breakaway collars with our phone number embroidered on them for the last 4 years. Check out: K9 Collars Cammie wears blue with red embroidery and Halo and Pepper wear red with blue embroidery. I was concerned that they wouldn't break away for a little kitty (Pepper is barely 6 pounds) but they work well. We bought a few extra in case they fell off but that hasn't happened.