http://www.humanesociety.org/issues/pet_overpopulation/ 2.7 million Pet Overpopulation 4 million dogs and cats this Humane Society Humane Society http://www.humanesociety.org/issues/pet_overpopulation/ estimates 4 million dogs and cats website Why Spay/Neuter? the statistics are not in their favor eight million cats or dogs Pet Overpopulation, Humane Society of the United States via massive number of shelter pets 4 million dogs and cats 4 million dogs and cats humane society Why Spay/Neuter? almost 3 million dogs 4 million dogs and cats The Humane Society of the United States: Pet Overpopulation HSUS Why Spay/Neuter? The Humane Society of the United States Why Spay Neuter? battling to end the euthanasia alive. 4 million dogs and cats estimates 4 million dogs and cats http://www.humanesociety.org/issues/pet_overpopulation/ estimates 4 million dogs and cats pet overpopulation crisis 4 million dogs and cats 4 million 4 million dogs and cats 4 million cats and dogs according to the Humane Society pet overpopulation Humane Society of the United States work to end any killing battling to end the euthanasia According to the Humane Society of the United States Why Spay/Neuter? Human Society of the United States HSUS estimates 4 million dogs and cats pet overpopulation 3,999,999 dogs and cats The Humane Society of the United States ending the euthanasia of healthy and treatable pets The Humane Society of the United States Pet overpopulation more than half are put to death Why Spay/Neuter? http://www.humanesociety.org/issues/pet_overpopulation/ 2.7 million healthy 4 million cats and dogs Pet overpopulation The Humane Society ending the euthanasia of healthy and treatable pets 4 million dogs and cats pet overpopulation 4 million dogs and cats figures 4 million dogs and cats ending the euthanasia of healthy and treatable pets Humane Society 4 million dogs and cats http://www.humanesociety.org/issues/pet_overpopulation/ estimates 4 million dogs and cats pet overpopulation problem http://www.humanesociety.org/issues/pet_overpopulation/ work to end any killing