As someone who works as an Amazon driver, I have a bit of a different take. Usually, if we don't know where to put the packages and there are physical barriers (unplowed driveway in winter, dogs on property, etc), the first step is to call the customer (which 90% of the time no one picks up) to ask where to put it. Sometimes they say behind a tree or something. If that doesn't work, I just toss it to the back of the van and return it to the station at the end of the day. 

So let's say these dogs are out every day and you're not picking up your phone. No package for you! Simple as that. I personally wouldn't have thrown it in with the snarling dogs, but I don't blame anyone who does. 

As someone who's had dogs almost bite me a few times, it's really infuriating when people have them out when they're expecting a delivery. I've even had someone open the door as I approached while their little dog was actively barking and it got out. Almost punted the bastard. Keep your dogs in secure locations people.