I know what this picture is without having to look - if it makes anyone feel any better, there are being serious questions asked about its' authenticity - in terms of where and how it happened, I have read different stories, and it is highly likely that the photo may have been manipulated.
Or at the very least, this incident occurred quite some time ago and is being regurgitated on the internet.
There are people out there who encourage very disturbing pictures to go viral on the internet, it is not about preventing animal cruelty, it is about sick people who get a kick out of spreading horrendous pictures, it is spam, pretty much.
Please do not assist them by posting this image anywhere else, imagine if a young child were to see it.