That's where we got the references from, of both wild and captive pandas; this tail was based solely on photos. There are two subspecies of red pandas: the Western Red Panda, which has a lighter coat and faded markings on the face and tail (which can be purely blond or even white, having no markings at all), and the somewhat larger Styan's Red Panda, which has a much darker face and tail and well-defined markings. This tail (and the rest of the panda parts of the suit) is based off the Styan's panda.
Three different colours of fur - fur is plastic and so cannot be dyed in the conventional sense.
It is possible to 'dye' large amounts of fur by painting it (coating the fibers rather than impregnating them with colour), but it is extremely labour intensive, affects the texture of the fur, and is not 100% colourfast.