Commenting on D&C 77:
Because of the Atonement, all
animals will be heirs of salvation in their own spheres. The spirits of animals
are eternal and in the likeness of their bodies. (Mary Jane Woodger, The Essential Doctrine and Covenants Companion:
Key Insights to your Gospel Study [American Fork, Utah: Covenant
Communications, Inc., 2012], 152)
Further Reading:
B. H. Roberts Foundation, Teachings on
Animal Spirits (cf. Primary
Sources)