That’s Not My Shadow

I had a black dog named Shadow. I let him out one night, then went back in to grab a jacket. When I came back out, I called him. All I could make out was a big black shadow running from the far side of the yard.
I figured it was him…until I heard a noise to my left and saw my dog coming around the corner. When I turned back, whatever was running across the yard toward me was gone.
Story credit: Reddit / Crowblue