If there is no tan then it's a stumpy tail australian cattle dog, heres some pic's,they are more slim then acd's
The head of the Stumpy Tail Cattle dog is balanced with the body. The eyes are medium sized and oval shape. The ears are broad at the base, set wide apart on the head and of medium size. The muzzle is medium and tapering to a point. The nose is black and self-colored according to coat. The bit is scissor or level. It has a medium length and extremely strong neck and a deep and muscular chest, with well-sprung ribs. The body is level back that slopes at the rump. Forelegs should be perfectly straight when viewed from the front. Hind legs are broad, strong, muscular and straight from the hocks to the feet when viewed from the back. The feet are round with short toes. It has a natural bobtail. Its coat is medium-short, straight, dense and harsh. Colors include red speckled with darker red markings on the head or blue speckled with black markings on the head.