Approximately 237,000 dogs were killed in U.S. shelters in 2024, according to Best Friends Animal Society’s national data report. That number represents a 6.2% increase over the previous year, making dogs a growing concern even as cat euthanasia hit a historic low. The total across all animals (dogs and cats combined) was roughly 425,000 in 2024, or about 607,000 when counted by the ASPCA using a broader dataset of reporting shelters.
The Numbers Have Dropped Dramatically Over Decades
The current figure is a fraction of what it used to be. Older estimates from the 1970s and 1980s placed annual shelter euthanasia for all animals at somewhere between 12 and 20 million. Even within the last five years, shelter euthanasia rates dropped from 13% of all intake animals in 2019 to 8% in 2024. That decline reflects decades of spay/neuter campaigns, adoption marketing, foster networks, and the growth of the no-kill movement.
But the trend for dogs specifically has reversed. In 2024, for the first time since Best Friends Animal Society began tracking national data, more dogs were killed in shelters than cats. Cat euthanasia fell 10.5% to 188,000, while dog euthanasia climbed to 237,000. The overall number of animals killed held roughly steady year over year, but the balance shifted.
Why Dogs Are Euthanized
Shelter euthanasia falls into three broad categories: medical, behavioral, and space-related. Dogs with untreatable illness or severe injury account for a portion that most people accept as humane. The more contentious cases involve dogs that are physically healthy but deemed unsafe to adopt, or dogs that simply run out of time in an overcrowded facility.
Aggression is the leading behavioral reason dogs are euthanized. Research consistently identifies human-directed aggression, particularly toward adults in the household, as the most common trigger. Aggression toward other animals, especially other dogs in the home, is the second most common. These are also the top reasons owners surrender dogs to shelters in the first place. A dog with a documented bite history is difficult to place, and many shelters lack the resources for long-term behavioral rehabilitation.
Overcrowding drives the rest. When a shelter fills beyond capacity and no foster homes or rescue transfers are available, staff are forced to make room. Government-run municipal shelters are especially vulnerable because they’re legally obligated to accept every animal brought in. Private shelters and rescue organizations can limit intake, which gives them significantly lower euthanasia rates. Raw data from New Jersey illustrates the gap: one private shelter, St. Hubert’s Animal Welfare Center, took in over 2,200 dogs in 2023 and euthanized 17. A municipal shelter in the same state took in about 400 dogs and euthanized 238.
Pit Bull-Type Dogs Face Higher Risk
Breed plays a measurable role in which dogs survive the shelter system. A 2024 study published in Frontiers in Veterinary Science, covering 21 shelters across the U.S., found that pit bull-type dogs made up 16% of all dogs surrendered but were euthanized at more than double the rate of other breeds: 13% compared to 5%. They were also less likely to be adopted (67% versus 73% for other breeds).
Even after controlling for age, length of stay, and the reason for intake, pit bull-type dogs had significantly lower odds of leaving the shelter alive. Breed-specific housing restrictions are a major factor. The same study found that housing-related surrenders disproportionately involve pit bulls because landlords and insurance companies frequently ban them. Once in the shelter, these dogs stay longer and face breed bias from potential adopters, compounding the problem.
More Dogs Coming In Through Government Agencies
Overall shelter intake in 2024 held steady compared to 2023 and remained about 13.6% below pre-pandemic levels. But that stability masks an important shift. Government agencies, the municipal shelters and animal control operations that handle strays and owner surrenders, saw intake rise 7.9% in 2024. Private shelters with government contracts saw intake drop 7.2%, and private shelters without contracts saw an 8.8% decrease.
This means the burden is concentrating in the facilities least equipped to handle it. Municipal shelters typically operate on tighter budgets, have less fundraising capacity, and can’t turn animals away. The post-pandemic period has been particularly challenging: the wave of pandemic-era adoptions created a temporary dip in shelter populations, but as people returned to offices and faced housing changes, surrenders climbed back up. Dog adoptions as a percentage of intake inched up only slightly, from 56% in 2023 to 57% in 2024.
Transfers, where shelters move animals to other organizations with more capacity, also continued declining. About 524,000 dogs were transferred between shelters in 2024, down 4.5% from 2023 and a steep 37.6% drop from 2019. Fewer transfers mean fewer second chances for dogs in high-intake facilities.
What “No-Kill” Actually Means
The no-kill movement defines success as a 90% save rate, meaning 90% of animals entering a shelter leave alive through adoption, return to owner, or transfer. That threshold, established by Best Friends Animal Society, intentionally leaves room for the roughly 10% of animals that may be euthanized for severe medical conditions or dangerous behavior that cannot be safely managed.
A growing number of communities have reached this benchmark, but the national average remains below it. The 8% overall euthanasia rate reported by the ASPCA in 2024 suggests the country is approaching that goal in aggregate, though the average obscures wide regional variation. Shelters in well-resourced urban areas with strong rescue networks may save 95% or more of their animals, while rural shelters and underfunded municipal operations in the South and parts of the Midwest can have euthanasia rates several times the national average.
The 237,000 dogs killed in 2024 represent real progress compared to the millions killed annually a generation ago. But the recent uptick, concentrated in government-run facilities and disproportionately affecting certain breeds, signals that the trajectory is no longer guaranteed to keep improving without targeted intervention in the communities and shelter systems under the most pressure.