My cat simba likes to pop his collar off from time time. Its a safty collar. The clip has so many bite marks on it..it doesnt stay closed that great. Which makes it easy for simba to pop it off. He was feral in the beginning. Since i took him in..he has been wearing a collar since. I just wish he would leave it alone. Atleast when he pops the collar he does it in my bedroom on the bed. So its easy for me to find and put it back on.