The Koolie coat ranges from short/smooth (like that of the original blue merle Collies from Scotland), short (like a working Kelpie), medium and, not common, long (like the show Border Collie). Koolies are typically slightly longer than tall. The Koolie coat ranges from short/smooth (like that of the original blue merle Collies from Scotland), short (like a working Kelpie), medium and, not common, long (like the show Border Collie). Koolie colours can be solid (all one colour black or red/chocolate (this includes Koolie who are cryptic merle: carry the merle gene but do not display it obviously)) 'bi' (black &amp; white or red &amp; white) 'tri' (solid red or black, with white markings, normally with brown points), or 'tri merle' (same description but merle) 'merle' (grey, black, red/chocolate or white undercoat with large splashes of darker colourings of red/chocolate for red merles or black/grey for blue merles).