The Fox news link tells a different story.
http://www.foxnews.com/us/2017/04/11/usda-halts-use-m-44-cyanide-bombs-in-idaho-following-death-family-pet.html
Fox news says the dog set off the device, the AP story says the boy set off the device.
Need to correct myself, the Fox news story doesn’t mention the boy setting off the device.