Since my horsie budget this month goes to feet, floating and vaccines - was really hoping someone here could shed some light on this. This strange giraffe pattern appears only on one side of my 25 year old Arab mare. Otherwise in perfect health - no other symptoms presenting. No change in food, feet are great, weight perfect (if not a little chubby - easy keeper!). Fed Elk grove stable mix and grass hay. This started appearing very subtly 3 weeks ago, but now has gotten more dramatic if you will. The lighter color hair is slightly different texture but not thin. This is presenting only on one side, and she doesn't stand in one place all day. Called my girlfriend in CA (I'm in NV) that is very knowledgeable, and she has a horse that started this about 6 weeks ago. Same thing! Her palomino is 12, grass fed. No other symptoms. She runs a NFP Horse Camp/Farm and all her people have never seen this, either. First picture is my mare, second is hers.