Amos, you're only now figuring out the dog communication network? I bet you notice barks in the neighborhood that you would have ignored or dismissed in the past. There was a PBS program that offered a series of dog barks and people who live with dogs can easily recognize the difference between happy, scared, threatening, alerting on strangers, etc. Ms. Maggie will teach you many things in the coming years, so say Poppy, Cinnamon, and Zeke. :)