[MC-271357] The front and back legs of a fox cannot be independently retextured

(Issue first appeared in 19w07a when foxes and their UV maps were added)
The front and back legs of a fox cannot be independently retextured, resulting in them always looking the same. This is limiting to a player's creativity and ability to modify the entity's texture. This is also unusual when you consider that the right and left legs can be independently retextured, and that the ears can be too.

Steps to Reproduce:

Download and apply the provided resource pack:

[media]

Spawn a fox, or snow fox

Observed Behavior:

All four of the fox's legs will look entirely red, despite the player seemingly only modifying two legs in the UV map.

Expected Result:

Only two of the fox's legs would be altered, since that is what the player intended to change. The current behavior is unexpected and not resource pack friendly.