OH yea...
My guys Howl, I don't think that many of our Yorkies do that.
It's mainly when they see other Dogs, always at a distance. When it was just Sneakers and Becca, they did it in Harmony. Surprisingly, Becca has a deeper voice then does Sneakers, who outweighs her by 5 lbs. But since Ickey has arrived and joined them, it's more like a Minor 7th