So I have two cats who break outside no matter what. We open the door for one second too long? They rush out at max speed and disappear. They've even managed to find a way to get outside through a small gap in the house we didn't know existed and have since patched it. It's insanely difficult to rangle them back in because they're so fast. They usually stay around the general area but it just worries me insanely whenever they're gone. I don't want someone to assume they're strays so we wanted to add a tagged collar on them- but apparently those are choking hazards? And break away collars can be easily removed. Is chipping a good solution or is there another alternative to let people know to return them if they see them.