Dogs have a problem with keeping their collars on.. any advice?

Well, I'm not sure how this would be, good or bad....but if you supervise them at first, you could maybe try chain. But depending on how vigorously your dogs attempt removing their collars, it may be too much. That is a point, what type of collars are they, if you could get them tailor made. My collie chewed her first collar by the time I'd cleaned her bowl, she was in the same room as well! The collar was only cheap, but we got a Red Dingo which is great and its lasted more than 7 weeks, so try a better one.