Mini Daschund Howls when alone for an hour

Mini Daschund Howls when alone for an hour

Zippo left alone for an hour. Cat tent (with 1 cat) is on right. Fish tank upper left. We did not know he was making noise. This was his 1st time out of his crate ever while alone. He moves the camera, looks in the fish tank and tries to get the cat to play..