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The Humane Society of the United States supports indoor-only living for cats, but some owners remain convinced that life in the “great” outdoors can be beneficial. A new study on the secret lives of feral and free-roaming house cats solves the mystery. One message is clear: Living outdoors poses countless threats to cats. Here, learn why the life expectancy for outdoor cats is shortened by about 10 years versus that of indoor-only house cats.
Roaming Over Widespread Territories
Richard Warner, an emeritus professor of natural resources and environmental sciences at the University of Illinois at Urbana-Champaign, and his colleagues conducted the study, which was recently published in the Journal of Wildlife Management. Using radio transmitters and other high-tech equipment, the researchers tracked every move of 42 owned and unowned cats living at the southern edge of Champaign and Urbana, neighboring cities in Central Illinois.
As anticipated, feral cats had larger territories than the pet cats and were more active throughout the year. Even the researchers, however, were surprised by one mixed breed male, which had a home range of 1,351 acres, the largest tract of all cats tracked.
“That particular male cat was not getting food from humans, to my knowledge, but somehow it survived out there amidst coyotes and foxes,” says co-author Jeff Horn. “It crossed every street in the area where it was trapped. [It navigated] stoplights and parking lots.”
The average home range for pet cats was 4.9 acres, but as Horn says, “That’s a lot of backyards.” They ran, stalked prey, slept, rested and often encountered feral cats looking to establish dominance over an area. For example, each morning during the study, one feral cat waited for a particular pet feline to emerge in its garden. The feral animal would then attempt to chase away the house cat.
All outdoor cats can encounter various wildlife, in addition to the viruses and illnesses harbored by both feral cats and other species.
"For example, Toxoplasma gondii, a parasite spread primarily by cats, may cause neurological, reproductive and even respiratory problems in humans, cats and wildlife, depending on the species affected," says co-author Nohra Mateus-Pinilla of the Illinois Natural History Survey. “Rabies, cat scratch fever, feline leukemia and feline immunodeficiency virus are also of concern to pet owners whose cats encounter other cats outdoors. Vaccination of pet cats will reduce but not eliminate the threat of disease transmission.”
Warner agrees. “Two of the leading causes of cat deaths in that study were other cats and disease, and both of these leading causes of death are sitting here waiting for these owned cats outdoors.” This concern about disease doesn’t even take into account other threats, such as ingesting poisons, getting hit by a car, running into neighbors who hate cats and more.
Adam Goldfarb, director of the Pets at Risk Program at the Humane Society of the United States, admits that in a perfect world, cats would be able enjoy the exercise, fresh air, sights, smells and sounds of the outdoors. The answers then are to help provide your cat with related experiences inside, or to fully control your pet’s time outdoors. Goldfarb suggests following these four steps:
Goldfarb urges owners not to buy into the stereotype that cats are somehow loners. They love receiving attention and hanging out with their owners. Just like a satisfied human mate, a healthy and content cat will easily let go of its roaming ways in exchange for a better, safer life indoors with you.
Jennifer Viegas is the managing editor of The Daily Cat. She is a journalist for Discovery News, the news service for the Discovery Channel, and has written more than 20 books on animals, health and other science-related topics.