Hi there,
That sometimes happens after a cat heals from being sick.
To correct the leg color you can put the cat in and out of low prim mode.
Low Prim Mode: Left click on cat > Prims > Low Prim > 2D Cat, then Low Prim Off.
That should correct the issue, if it does not, please file a support ticket with the cats ID# and our team will be happy to assist you further.
Green Leg
