There have been reports of a brindle Sheltie but many Sheltie enthusiasts agree that a cross sometime in the ancestry of that specific Sheltie could have produced a brindle. Unacceptable colors in the show ring are a rustiness in a blue or black coat. Colors may not be faded, no conspicuous white spots, and the color cannot be over 50 percent white. A tri-color Shetland Sheepdog puppy. Tipped ears, i.e. partly folded upright ears, are a desirable trait. 2.2 Height and weight.