I had a thought about the fence. He probably did use it to help burn the body, but I'm wondering if he didn't DECIDE to use the boards because of the dog? Remember it was said previously that they started to tie the dog in the front yard recently? I"m wondering if he didn't decide to take the fence boards down and leave an opening in the fence as an excuse to tie the dog up front. See where I'm going? Can't take a chance and leave the dog in the back yard, he might dig up "something". Can't leave the dog in the back with an opening in the fence. So he comes up with an excuse, the fence was broken, rotten, whatever to tell to Xtina. The fence then serves two purposes, to put the dog in the front and also to use as fire fuel. Eh?
That's a great point. You are right, he couldn't leave the dog in the back with a buried body. I wonder if they can pinpoint exactly when the dog started being tied up in the front yard.