I had a boxer dog client with a hip dysplasia surgery, a very unhappy female dog who could not stand on her back legs for long periods. The owner came complaining about her dog not being able to stand or walk for long periods of time as she would get very tired but never mentioned about her sadness.
I did a few Quantum Entrainment sessions with her, and she has become a truly happy and active pet even though her legs still get tired she is able to spend longer periods of time standing and running.