you may want to take a look at Dolores Cannon's book "Between Death And Life" where exactly this information on animal pets is imparted via regression (and Higher Self channeling) hypnosis, it says that formerly group spirit based entities (not just animals) maybe 'evolve' into single souls by contact with humans who already are evolved single souls (who themselves maybe even have evolved to this state from previously being part of a group soul too)
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