Genetic segregation patterns among blood type markers and various phenotypically observed traits were studied in a small herd of ponies. The herd consisted of 10 mares without white spotting and a single stallion with the dom inant pattern of tobiano spotting. Comparison of segregation patterns at loci for which the stallion was heterozygous showed tight linkage for the Alb-B and tobiano markers. In 17 cases in which the AIb contribution of the sire could be determined, all 10 foals that inherited AlbB from him were tobiano spotted, and all 7 nonspotted foals inherited his AlbA. The use of the symbol To is proposed for dominantly inherited tobiano spotting linked to the albumin.