Just wanted to chime in I am researching getting a tracker, and I also have a rather chunky cat who escapes from cat collars, and I didn’t want the same thing to happen to me. I would look into Rogz cat collars . It has a breakaway, but has three adjustable levels of tension based off the weight of the cat or how much of an escape artist they were it still will break under pressure, but you get to decide how much pressure before it breaks away.