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Specific Help with photo editing (paste dog on a photo)

Hi everyone. I am a novice in the use of photo editing programs. I need to put the dog attached below in the road on the second photo as if he were looking at the temple.
I tried it myself, but I can't get any better results than this. Missing the shadow of the tree on the dog's head (I don't know how to darken the hair) and you notice too much that it has been pasted on the photo
Is there anyone who can help me? I will be grateful to you forever. Thank You.