I actually thought of something that would take a lot of programming, but would be neat. Why not see about adding a feature to customize fur patterns if we ever get stripes, dots, ETC.
You could customize how large the pattern may be or what color it is. You could customize how much you want. Say a small amount or a large amount covering the whole body. They could also give several different options for the way they are angled ETC.
Humanoid Borg tend to go bald, and take some time to grow their hair back, felinoid fur would likely be the same issue. Though a part-grown part-bald infected look with ashen fur might suffice to show that while the infection is being cured slowly, it's still going to be a while before all that fur grows back; felinoids would have a longer recovery time before they look "normal" I think.
Or they can just slap the veiny stuff on the fur or make the fur a translucent, "thinned out" cover on top of the skin. Probably quicker that way anyway.