Within the traditions that hold to rebirth, the answer is clearly no, lives are not assumed to be only human. The older religious frameworks that shaped the modern idea of past lives describe a far wider range. In Hindu and Buddhist accounts of transmigration, a being can be reborn across many forms, human, animal, and various spirit or otherworldly realms, with the form shaped by karma rather than chosen. Rebirth as an animal appears in classical texts as one possible turn of that cycle. So the notion of a non-human past life is not a fringe modern invention; it has deep roots in those teachings.
In contemporary past life regression, the variety widens further. People under guided relaxation sometimes report having been an animal, a presence without a body, or a being on another world, alongside the more common human scenes. Practitioners differ on how to read these. Some treat them as literal prior incarnations across the spectrum of life. Others view animal and spirit reports as the mind speaking in symbol, an image of instinct, freedom, or detachment rather than a record of a specific creature.
What the variations cannot do is establish that any of it occurred. Past lives, human or otherwise, have never been verified, and the imagery that surfaces in a suggestible, relaxed state is best understood as a construction of imagination, memory, and expectation. A scene of having been a wolf or a wandering spirit is no more confirmed than a scene of having been a medieval farmer. The breadth of forms people report says more about the reach of imagination and the influence of cultural belief than about the structure of any afterlife.
There is a pattern worth noticing in which forms tend to appear. Animal lives that surface are often noble or striking ones, an eagle, a great cat, a loyal companion, rather than an insect underfoot, and that skew hints at the imagination drawing on meaning and self-image rather than sampling existence at random. The same caution applies to spirit reports, which tend to arrive wrapped in significance.
Read as imaginative or symbolic material, an animal or spirit life can be interesting to sit with, a different angle on how a person sees instinct, loss, or belonging. The mistake is to treat the range of forms as proof that the soul travels through them. The variety is a property of the stories people tell, not a map of where they have been.…