This is a failure of the dog owner to set his system up properly. I have mine set for a 30' barrier. Also, most systems have multiple sets of prongs to use on the collar. My dog has fairly long hair so we went with the longer set. Further, she's a bit of a speed demon so she doesn't get the "warning" buzz... She just gets the ZAP. She's learned quick where those boundaries are at.
You really think the blame lies with the owner when someone comes onto his property and shoots the dog which is lawfully on the property. Wow! So then the police and government must always be right no matter what then? This was a Golden Retriever, not a pit bull. You obviously don’t know dogs.