http://www.kpho.com/story/18000171/couple-loses-baby-in-dog-park-attack
http://en.wikipedia.org/wiki/Greyhound
"Due to the Greyhound’s athleticism, they need daily exercise, but should be kept on leash or in a fenced area due to their tendency to run."
"Greyhounds(as a sight hound) will typically chase small animals; those lacking a high 'prey drive' will be able to coexist happily with toy dog breeds and/or cats" But I would think in the case such as this, the little dog was prey. I hope they find the owners who should be held responsible.