Kimberley Pearce, 40, from North Carolina, was videoing Bella scampering around the house when she believes her beloved cocker spaniel Sadie, who had to be put down just one week earlier, returned to comfort her.
Mrs Pearce said: "It was only a few days after when I was showing the video to a friend that I saw her appear. I just knew it was her. That was my dog.
"You can see it's a white and caramel colour, and so was my little girl.
"The video had been taken around lunchtime and no cars go past my house to make a reflection, and no birds for a shadow or anything. We live quite far out in the country.