But here is another way to use the Generative Fill. I didn't notice a log very close to me was blurred and covered the back of the wolf until the wolf was done standing there and jumped off. Generative Fill very effectively and quickly saved this image.
Click on Generate and you will receive a new layer with those options to pick from.
If you really want to go further and remove the entire background continue reading the steps below. After I flatten the layer I am going to now select all of the background and enter snow covered trees in the prompt. Then click on Generate.