lol I will be bringing extra collars, Happy does not pull, just Misty, she is getting much better though, but just in case I equipped her with MUCH stronger key rings lol like those big heavy duty things, and I have an even stronger one I can always attach if needed. I will be taking them to a park to run anyway, and I Misty will be wearing an extra collar just in case, for Happy it really does not matter she walks off leash all the time lol