It would probably help to give a little info, including a pic or description.
Health history, temperament, present care, etc.
A why its free also wouldn't be a bad idea.
I hate seeing just free because often it means sick animals, or neglected animal, mean animal. At least thats what I have found with free or cheap more often than not.
Thats not a bad thing, but its best to state the animals condition so people are aware it may need special care for awhile.
I have rescued many animals that people just couldn't upkeep.
Its best to look for someone who wants to help the animal than assume they are getting a perfect animal.
If its a good animal, then say so!! No reason not to, and a home would probable be found quite quickly!