we leave on 2 radios
1 in the area they spend the most time when we're gone and 1 in another room by the street to drowned out noise from outside. Nina barks at all the dog sounds coming from the TV so it has to be radio. She also barks if some one knocks at a door on TV.
I leave a TV on all night in the bedroom, as a night light ,no sound, but also because kelcee (cat) loves to watch it. As soon as I turn it on she is looking
Katz