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a small (13-16 inches tall), alert dog with abundant, medium-length haircoat that forms a thick 'mane' around the neck. It may be black and white, black and tan, blue merle, sable or tricolor (black, tan and white). The head is long, narrow and flat in profile with small ears that fold over at the tips. The dog looks like a collie in miniature. The breed is predisposed to collie eye anomaly, retinal atrophy, hemophilia, nasal solar dermatitis and iris heterochromia. Called also sheltie, shelty.