I actually use a quicklink to put Roxie's tags on her collar. They're more secure than clips and it's easy to switch collars- just break out the pliers and untighten it, switch it onto the other collar. Plus it's kind extremely complicated for a dog to get undone... but there's the s-hook to connect the tag and quicklink, so... that might be an issue? Idk. I just got the smallest I can find at home depot, so it could be a solution. They're pretty hardy. Also, I use Boomerang Tags. They are EXCELLENT.