Another photo of our pup. He's around 15 weeks here - he looks much older in this image! Must be the angle.
I used the texture: Eastman from the Glorious Grunge Collection.
Blend Mode: Multiply at 100% opacity.
I also duplicated the layer and set it to Normal Blend Mode, filled the layer mask with black and then painted with white along the edges in some areas for greater texture coverage.