If you want to save the original dog image, be sure and duplicate image and close original before starting.

*Read tip at bottom before starting

Adding Drop Shadow

Open photo and minimize....

Make a New Image (Control N on keyboard)
Size....same dimensions as your picture > color white
Check bottom right Status bar for size.

You are going to add a border to the New Image.....

Image > Add Border
Enable: Symmetric
Size in Pixels: 15
Color white.

Bring up minimized picture
Right click top and Copy >

Right click top of New Image
Choose Paste as new layer.....into the new blank image....it will center.

Effects > 3D Effects > Drop Shadow >
Setting (reading from top down) 0.....0....50....2.00.....Black

Repeat...
Effects > 3D Effects > Drop Shadow >
Change setting to:... 5.....5....50....3.00

Merge Flatten
Save

* Tip:
If you want to add a narrow border to photo before adding drop shadow. Add a 1, 2 or 3 pixel width size border to the original image before, adding drop shadow.
Example: 3 Pixels

Joy

Also, good job on the drop-shadow.

Joy