The question almost answers itself: Because "someone" wanted to put it on the Internet.
Simple commonsense will answer all of the subsequent questions ("Why would 'someone' want to put...?" "Because 'someone' had something to gain by putting..." etc.).
Regards,
Ok Sherlock ;)
Yeah, maybe someone had no other motive than to protect the dog from further abuse. His friend has a right to know he's abusing his dog when he's not looking.
He didn't just kick the dog, he pulled the leash way up where the dog was no longer able to stand choking him, just mean all the way around. The boy's got issues.