Start with the veterinarian. What a trainer, a consultant and a veterinary behaviorist each do, and how to read credentials in an unregulated field.
Your downstairs neighbor is not hearing a cat, they are hearing landings. Map the four spots she jumps down from and treat those, not the whole room.
Five constraints compete for one spot: the outlet, the shared wall, your sleep, the animal, and water near cords. Here is the order that decides it.
The motor is not what carries. Kibble hitting a steel bowl is an impact, which is why the unit below hears your feeder and the one beside you does not.
They know things you do not, because you are out when it happens. Four questions that turn an awkward doorstep conversation into the data you need.