Zack & Zoey Elf Slippers

I'm looking for four sets of small Zack & Zoey Elf slippers, but I want the option to return should they not fit. I have measured my dogs and gone according to the size chart, but I've had experiences where I've done that and the item still not fit. I do not plan on using and returning, I just want the option of exchanging for another size if the slippers do not fit. Please contct me if you can do this. Thank you!