דֹּב dob "a bear" occurs as a pair with 'ariy "lion" in Prov 28:15; Lam 3:10, but most notably in the story of David (1 Sam 17:34,36,37). In all but one case the "lion" comes before the "bear" (as in Amos 5:19) presumably indicating that the bear was considered the more fearsome of the two - Hebrew poetics usually adds precision or strength to the second stich in parallel lines (Alter's chapter on "The Characteristics of Ancient Hebrew Poetry" in The Literary Guide to the Bible).