Not necessarily a sinew backed horse bow. Many Native built quite short selfbows that were drawn 18" to 22" or so. Most were in the western portions of this country, mainly because they did ride horses but also because they were limited to smaller trees and shrubs that were appropriate for selfbow building. East of the Mississippi, the Eastern Woodlands had plenty of bigger trees and shrubs and they primarily walked and didn't necessarily use horses so their bows were from 60" to over 70" long.