I can only assume, that like here in the U.S. (and every country in the world) someone or many someones die every day. Then I can also assume that he dogs must be howling every evening...
I've never heard anything about dog's howling & banshees but I have been told that the howling of foxes is attributed to banshees. I grew up in the country & did hear several stories about banshees howling around the time of someone's death - they were all living on farms in an area with a large, active population of foxes.
This is a link I found to supersitions about dogs, if you scroll down the page you'll find info on dogs & howling: