Reusing dog collars?

So I have a mastiff puppy who has outgrown her collar. We still have my old girls collar who passed away in July(she was my first dog).

I was thinking about using it for our new dog because it’s still in such good condition, really good quality collar. Then I noticed there’s still some fur stuck in it from the last time she wore it. So that’s making it harder to reuse it. Do you reuse collars? Idk what to do

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