Your edges are the thing I'd look at. The front paw especially has a really consistent sharpness all the way around, which flattens it a bit. In photos of fur (or in life), the edge quality shifts constantly: sharp where light hits a plane change, soft where it turns into shadow or where one form overlaps another. Varying that even just a little would help the volume come forward. What worked for me when I was stuck on this was doing quick value studies with a brush pen, forcing myself to lose edges on purpose.

Hard to say much without seeing the piece, but the thing that finally clicked for me on realism was stopping mid-render and asking if my values were doing the work before I touched color or detail. If the silhouette and big shadow shapes feel off, no amount of surface texture will fix it.