It's called the Yellow Dog Project. And as you can see below it is catching on.
It's basically a movement to let people know when a dog may need some more space than others. They aren't normally aggressive dogs...but perhaps dogs who deal with fear, pain, or aren't great with small children. Learn more about the YELLOW DOG PROJECT, CLICK HERE.
Now here is the tough part. If you know someone who has a jumpy or skittish dog that may need some more space... politely send them this story, link, or find the YELLOW DOG PROJECT on Facebook.