Jamieson, Fausset and Brown on Isaiah 11:6

6. wolf ... lamb--Each animal is coupled with that one which is its natural prey. A fit state of things under the "Prince of Peace" (Is 65:25; Eze 34:25; Ho 2:18). These may be figures for men of corresponding animal-like characters (Eze 22:27; 38:13; Jr 5:6; 13:23; Mt 7:15; Lu 10:3). Still a literal change in the relations of animals to man and each other, restoring the state in Eden, is a more likely interpretation. Compare Ge 2:19, 20, with Psa 8:6-8, which describes the restoration to man, in the person of "the Son of man," of the lost dominion over the animal kingdom of which he had been designed to be the merciful vicegerent under God, for the good of his animal subjects (Ro 8:19-22).