This study investigates the purchase behavior of sheep traders in Kajiado County in Kenya. This is, to the best of our knowledge, the first investigation on sheep traders by the use of Best-Worst technique. A face-to-face questionnaire was undertaken in three livestock markets (Kiserian, Bissil and Mile 46) involving 108 traders. The results indicated that sheep traders are also involved in other types of animal trading, essentially cattle and goats. Income from sheep trading represents slightly less of the half of total incomes, with some differences between livestock traders' groups (markets). Traders are generally involved in other business activities among the value chain essentially such as livestock production, fattening and slaughtering. Four attributes with different levels have been utilized to describe the Best-Worst experiment: sheep age, sex, breed and price. All sheep traders assign higher importance to the sheep breed. This is essentially the case of Dorper pure breed and Dorper x Red Maasai cross breed. Price attribute was the second most important factor for sheep traders with higher preferences for the two extreme price levels. Sheep age and sex were found of least importance for traders. Providing sheep smallholders with the appropriate animal breed characteristics will enable them match market demand and increase their incomes. This is one of tasks of ILRI Kapiti experimental farm.