They have been pet friendly for a while. There is a $5.00 per day charge and as stated several pet loops in all classifications. Basically dogs can go anywhere accept the pools, restaurants, and stores. There is even a dog park.
Here is a loop map that shows the selected pet friendly ones.
Fort Wilderness - Loop Classification Map - Information - Fort Fiends - Articles - Fort Fiends
Here is the pet policy:
Q.
How can I ensure a pet-friendly loop for my campsite at Disney's Fort Wilderness Resort?
A.
When booking your campsite, you may request a pet-friendly loop for an additional $5.00 per night.
If you
make your reservations online, select the “Add” button in the “Room and Amenity Requests” section. You will then be able to request a pet-friendly loop.
Please note: Pets are not allowed in pop-up trailers or tents.
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