How to make an automatic door closer...

I have three doors in my basement, one opens into the basement, one opens into the fruit cellar, and just enough room to open the outside door into the fruit room. Two of my dogs will not use a doggie door, but they all know how to open the doors that swing into the fruit room. They push the outside door in, and two bounces on the inside door opens it. I need to set them up to do a slow shut on their own, at the very least the outdoor one. BUT they both would hook to cement. :( Any suggestions?

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