Everything is a teacher. It need not be a human. It could be animal, vegetable, mineral or anything. Note that as long as you identify something as separate from you, you reach outside yourself for answers. You do not fully trust yourself as your own authority. Watch what happens as you view everything as a pointer or guide to the universal message conveyed in all situations. What is felt?
All experience is an invitation to see beyond the mind that identifies an apparent teacher. Recognize what is beyond the perception of 'personal', 'other' or difference. The soul is pure unconditional love and acceptance. It has no filters to distinguish between 'you' and 'them'. It only sees oneness.
Take the example of a mind's perception of dogs. A human can watch a small dog approach a big dog and bark like crazy. The big dog barks too. The human imagines a scenario; one dog is standing up for itself, defending territory or competing with another dog. Humans imagine confrontation.
From the vantage point of soul, dogs are an energy form that does not recognize difference in size, competition or fear as human minds do. Dogs recognize likeness and universal language unless conditioned. They recognize unique scents and see oneness. They echo love is its own best friend.