If you decide to visit Caddo Lake State park, I’m sure you’ll enjoy your visit. It’s a very nice park, with nice cabins. It’s in a relativity remote area, and Lake Caddo is a very interesting place to visit, especially if you take a boattour into the swamp area, although there is a nice "swamp" viewing area inside the park.
To get information about each park’s pet policy, I suggest you contact any park of interest to you and ask that park about their policy.
Me and my family are planning a vacation in the forest. We would need to rent out a cabin just because we have a huge family. It would be really nice if the cabin was pet friendly because we are wanting to take our two huskies. http://www.brownmountainlodge.com/