Just made an account to post this: hopefully it gets heard.
The comic is confusing the issue because it appears to actually be anatomically incorrect, though slightly. The guy gave Star Fox an extra leg segment.
In Foxes, Wolves, and similar animals, that "extra segment" of leg that shoots backwards into the air is actually their foot. Animals walk on the balls of their feet and their toes. Try standing up on your toes/balls - that what a fox is doing. The main difference between you and an animal is that the soles of their feet are very, very, long compared to a human's proportions.
Here's a picture.


[Forearms and hands here, but the differences are almost identical.]
The site this picture is from appears to be a quick primer on drawing animals; take a quick look
http://hippie.nu/~unicorn/tut/xhtml-chunked/ch03.html#basics-animal-canines-legspaws. Awkward Zombie might want to look at this for future reference.
Oh, and to answer his rhetorical question about Anthro-legs:
If an an animal has be anthropomorphized enough to have human hands, they logically should have human feet as well for the simple reason that the construction differences human hands and forepaws are very similar to the differences between human feet and hind paws. You really shouldn't have one without the other, but since when have fantasy artists really cared about that stuff?