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Additional file 1: Movie of phantom scratching” in a CKCS. There is a rhythmic and non-purposeful scratching action of the pelvic limb towards the shoulder usually not making contact with the skin. The trunk flexes and the head turns towards the scratching limb. This action can be elicited or exacerbated by excitement, exercise, touch and wearing of neck collars and harnesses. (Video courtesy of Ms. J Harrison, Passionate Productions). (MOV 97128 kb)
