A great way to add strands of hair or fur back into an image using the Smudge tool in Photoshop
Set the tool to around 60% Strength and with a size the same as the thickness of the existing hair.
Add a new blank layer and tick the option Sample All Layers before smudging.
Zoom in and brush in an outward direction from where the hair starts coming out. Try not to go too far out as this can look unrealistic.
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