Dream of child

I had a dream about cynocephaly, I was a child picking up rocks and put them close to a tree, at first a black dog was with me. Then I climbed the tree and stayed there for a while, but everything around me was getting dark and the dog, which was starting me, changed, its body was more human but it remains the dog head. I didn't want to move or anything, and the Las thing I saw before waking up was the dog's mouth wide open ready to bite me.