The Atonement covers more than mankind. Elder Joseph Fielding Smith spoke directly to this point: "It is a very inconsistent notion which is held by some, that the resurrection will only come to human souls, that the animals and plants have no spirits and therefore are not redeemed by the sacrifice of the Son of God, and hence they are not entitled to the resurrection" (Answers to Gospel Questions, 5:7). Joseph Smith taught: "I suppose John saw beings there [in heaven], that had been saved from ten thousand times ten thousand earths like this, strange beasts of which we have no conception all might be seen in heaven. John learned that God glorified himself by saving all that his hands had made whether beasts, fowl, fishes or man" (Words of Joseph Smith, 185). The Lord promised that "all old things shall pass away, and all things shall become new,... both men and beasts, the fowls of the air, and the fishes of the sea" (D&C 29:24).


Tad R. Callister, The Infinite Atonement. 2000. p.83