While I have seen signs at the edge of yards, I have not witnessed vendoring by puppy mills. I hate puppy mills. At the least, selling like that should be just cause for investigation, but those poor babies should not be ignored for the cause of roadside vendoring, they need to be rescued!
The puppies are not the only ones who suffer. It is one thing to breed a dog to preserve it's bloodline and a whole other thing to subject them to constant breeding and birthing.
Roadside vendoring should be considered a violation, but more needs to be done.
There should be strict guidelines as to what constitutes legitimate breeding services and agreeable breeding of the family dog.
I love puppies. If I ever witness such a rotten thing as roadside vendoring of puppy mills, I may be that "crazy lady" yelling at the vendors.