Zimmer (1990a) points out that the inference that the horse was known to the Indo-Europeans is primarily based on such poetic formulas as 'swift horse', 'horses of the sun', 'characterized by good horses', and so on. He feels that "the formulas tell us nothing specific about the use of horses, but archaeology and history supply the necessary information".
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in Bryant, E. F. (2001). The Quest for the Origins of Vedic Culture : the Indo-Aryan migration debate. Oxford University Press. Zimmer, Stefan 1990a. "The Investigation of Proto-Indo-European History: Methods, Problems, Limitations." In When Worlds Collide (311-344). Ann Arbor: Karoma. (316).