On the Wikipedia I found this photo of a red fox, labeled as being taken at Quesnel Lake, British Columbia:
Why would the fox have blue legs? Is that normal for a Red Fox?
Original vs. Adjusted
Adobe Camera Raw Temperature Adjustment +30 / Tint Adjustment +3
The fox has black skin and fur. The blue is just a problem with the White Balance of the photograph. See Adjustments made above.
This is similar to the Blue Dress / White Dress Meme this year.
I find it kind of hard to believe the legs appear blue because of "white balance". The nose and upper part of the legs are black, so it is not like all the black in the photo is appearing blue. – Imprisoned Rhesus
The reason the legs look Bluer than the Nose is that the nose is mostly black with no white and the front part is in shadow. The top part, which is reflecting some of the sky appears blue in the original.
The reason the legs look more blue is
The white fur will look far bluer when the white balance is off and will trick your eyes into seeing the black as blue.