It depends if you are in a room or at the RV site.
"Can I bring my pet with me?
Mt. Olympus does not allow pets in any of the rooms or tree houses. We do allow pets in the RV sites but they must be on a leash at all times."
This is very clearly stated on their website under the "about us" then "faq" sections.
Obtén una respuesta del personal y de los huéspedes anteriores de Mt. Olympus Resort.