We haven't even had the collar for one month and lost it. I am 100% sure that I put it on the right way but it still fell off (and got very lose) a couple of times. I never attempted to take it off myself, neither did my dog. We live in an apartment and only have one dog, so he doesn't have a crazy life where he is likely to lose it.  I am just SUPER sad and disappointed because I heard good things about the collar and did not even get one full out of 8 months worth it. Also, it's like losing 70$ on the street, which hurts as a college student.