Here is the statistic, and it is a bad one. Across 20 countries, roughly 35 percent of all cats and dogs are homeless, either living on the street or sitting in a shelter waiting. That is an estimated 362 million animals. For every two pets with a home, there is one without.
The breakdown: 143 million dogs on the street, 12 million dogs in shelters, 203 million cats on the street, and 4 million cats in shelters.
And here is the statistic that should actually change what you do about it. When researchers asked people who had given up a pet why, the leading answer was not cruelty, or boredom, or a change of heart.
It was housing.
The largest study anyone has done on this
The numbers come from The State of Pet Homelessness Project, an undertaking by a global coalition of animal welfare experts in partnership with Mars, and it is the largest study ever conducted into what actually drives pets out of homes.
The method was deliberately unglamorous: data pulled from more than 900 global and local sources, nearly 200 expert interviews, and 30,000 public surveys, across Australia, Brazil, Canada, China, France, Germany, Greece, India, Indonesia, Japan, Lithuania, Mexico, New Zealand, the Philippines, Poland, South Africa, Turkey, Thailand, the U.S., and the U.K.
The point of gathering that much data was not to produce a number for a press release. It was to stop guessing.
Helen Mills, vice president of corporate affairs and sustainability at Mars Petcare, has described the impetus plainly: welfare organizations working on this problem kept saying the same thing, which is that nobody could get at the causes without evidence, and nobody had the evidence. Measuring the scale, and identifying what was actually pushing animals out of homes, was the precondition for doing anything other than mopping up afterward.
The findings vary wildly by country, which is itself informative. In Greece, 69 percent of pets are homeless. In the U.K., it is five percent. The problem is not a constant of human nature. It is a product of local systems.
America’s numbers, and the cat problem
In the U.S., about 20 percent of cats and dogs are homeless. That works out to 5.9 million dogs on the street, 2.3 million dogs in shelters, 35 million cats on the street, and 2.1 million cats in shelters.
Read that cat number again. Thirty-five million free-roaming cats is not a shelter capacity problem. It is a reproduction problem, and it is the reason spay and neuter access, and trap-neuter-return programs for community cats, do more numerical good per dollar than almost anything else in animal welfare.
The other American finding is a warning. Nearly one in four U.S. dog owners told researchers they were thinking about rehoming their pet in the next 12 months. The most-cited reason was behavioral problems.
The three reasons, and why the order matters
The top three reasons Americans give up a pet: moving, behavioral problems, and no longer being fit to care for the animal.
Globally, over a third of rehomings were driven by behavior. And nearly one in five people who have rehomed a pet, or are thinking about it, point to moving and being unable to bring the animal along.
Those two causes, housing and behavior, look very different but they share a crucial feature: both are solvable upstream, and both are usually treated as personal failures instead.
Mills has been direct about what the data shows on this point: housing is a major driver of surrender, and unlike most of the causes on the list, it is one that rental policy reform could genuinely move, given enough political will behind it. Which makes it heartbreaking and fixable at the same time, a combination that ought to focus the mind.
That is the finding to underline. A person who loves their dog and cannot find a landlord who will take one is not a bad owner. They are a person facing a policy problem, and the shelter absorbs the result.
“We spend an enormous amount of moral energy on the character of people who surrender pets, and almost none on the lease clause that made them do it,” says Nina Vasquez. “One of those is fixable this year.”
The behavior finding cuts the same way. Behavioral problems are the most common reason animals get returned, and they are, overwhelmingly, treatable, especially when addressed early rather than after two years of escalation. Helping people find the right animal for their circumstances in the first place, and giving them real tools once they have one, would empty more kennels than any adoption drive.
The pets who were never surrendered at all
There is a quieter finding buried in the data, and it may be the most actionable one in the entire report.
Almost half of the people surveyed had lost a pet at some point. Almost 60 percent of those pets were never found.
A large share of the animals classified as homeless are not abandoned. They are lost. They belonged to someone who wanted them back and could not get them back, because the collar had no current tag, or the microchip was registered to a phone number from two apartments ago, or there was no clear photo to put on a flyer.
That is not a heartbreaking social problem requiring legislative reform. That is an afternoon of admin.
What actually helps
The report’s recommendations are unusually practical, so here they are without embellishment.
Before you get a pet, do the research. Get advice on what animal suits your actual circumstances: your finances, your time, your housing. Most mismatches are visible in advance if anyone looks.
Adopt from a shelter. It reduces the number by one, immediately.
Then work to keep them. Current ID tag. Microchip registered to a phone number you still use. Both take minutes and address the single largest recoverable category of homeless animals.
Get help with behavior early. Before it becomes the reason you are making a phone call you will never forgive yourself for. If cost is the barrier, there are organizations that help with vet bills and pet food, and shelters that offer behavior support specifically to prevent surrender.
Spay and neuter, and support TNR. Especially for cats. Thirty-five million.
If you cannot adopt, do something else. Volunteer at a shelter. Foster. Help an older neighbor with their dog’s walks so that the dog does not become a surrender. Support the groups doing the unglamorous work on the ground.
What’s new since this was written
The number that has moved most since the first report is not the homeless population. It is the number of people considering giving a pet up.
Globally, around 15 percent of pet owners now say they are thinking about rehoming their pet within the next 12 months, and the housing driver keeps intensifying rather than easing. Pet-friendly rental stock has not kept pace with pet ownership, and in tight rental markets the pet is the negotiable item.
That has pushed a specific policy fight to the front: pet-inclusive housing. The research argument is straightforward and increasingly well-evidenced. Landlords who accept pets keep tenants longer, have lower vacancy rates, and face turnover costs that outweigh the damage costs they fear. Several countries have moved toward giving tenants a default right to keep a pet, subject to reasonable objection, and the direction of travel is clear.
If that sounds like a dry aside in an article about homeless animals, look at the data again. A third of the world’s cats and dogs have no home, and the single most-cited reason people surrender the ones who do is that they are moving and cannot bring them.
The most effective animal welfare intervention available right now might be a lease.
References
- The State of Pet Homelessness Project. stateofpethomelessness.com
- Mars. “1 in 3 Pets Are Homeless According to New Global Report.” mars.com/news-and-stories/press-releases-statements/pet-homelessness
- Mars. “How Data Can Help Us End Pet Homelessness.” mars.com/news-and-stories/articles/ending-pet-homelessness
- Michelson Found Animals and Human Animal Bond Research Institute. “Pet-Inclusive Housing Initiative.” pethousing.org
- ASPCA. “Pet Statistics and Shelter Intake.” aspca.org/helping-people-pets/shelter-intake-and-surrender
