First, I believe all living things on Earth, and elsewhere, have souls, or spirits, and that when the physical body dies, the spirit lives on.
Second, I believe all living things will resurrect, that is, their spirit, and a new, perfect, immortal physical body in the likeness of the original mortal body will reunite to live eternally as a physical, perfect entity, and that the new, resurrected being has the likeness of their mortal bodies in the primer of that life, however long or brief mortal life was for that individual. For us humans, about 30 years of age. For a dog, about 4 [30 ÷ 7] I suppose.
Third, I believe that all living things, with the exception of humans, live perfect lives, fulfilling the full measure of their creation, and, therefore, will inherit heaven whether we do, or not. We are unique in that regard; we humans have the capacity to sin, to willfully disobey. All other lifeforms have no understanding of good and evil.