Cats' or dogs' tags are on rings or S-hooks and they tend to snag on carpeting, especially berber.
My solution: I put a bead of hot glue
on the end of those. When the glue dries it becomes a plastic 'stopper' which will keep that from happening, but when it's time to put new tags on those rings, I can simply cut out the glue, replace and put another bead of glue there.
My husband had suggested soldering, but I think this will hold just as well AND be easier to remove.