Eating Hair

[Gypsy Wolf]

Hi all,
I notice a strange habit Luna has - eating hair. It seems whenever her tummy is upset, she hunts around the house for any hair that I might not have swept/vaccuumed up and eats it. She will even occasionally chew some hair off the tip of her tail.
THe only thing I can think is tha this is an attempt to "self-medicate" - her tummy is upset and instinct tells her that hair will help. I know that wolves in the wild eat hair and part of the theory behind them being able to pass large amounts of bone through their digestive tract is through having the hair sort of push it along through.
Just curious if anyone else has noticed this strange habit?