Hello Sunshine! Perhaps the best advice I could offer is look more at the way the fur is flowing and the way that the light interacts with it, so that you give an impression of fur, of course using brushmarks in the same direction as the fur.
Try also using the side of the brush, of which I'm a great advocate, to sweep across the paper (the rougher the paper, the better) and keeping the brush fairly dry.
The best way I can suggest of trying this is to use a piece of scrap Watercolour Paper, and try this, using the brush as I have suggested.
Look also at some of the colours reflected in the fur, as when you look closely, there are many subtle colours which make up the overall fur colour.
I hope this may help a little, but come back to me if you want to be more specific, and I'll do my best to help.
RSC Wigan / Warrington / St Helens