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What does “no-kill” mean?
In Best Friends Animal Society’s definition, no-kill means saving every dog and cat in a shelter who can be saved. Its ordinary benchmark for a no-kill designation is a save rate of at least 90%, with an exception process for unusual circumstances. The threshold is an organizational benchmark, not a universally agreed scientific standard.
The label therefore does not mean that no animal is ever euthanized. Best Friends’ own formula counts some outcomes other than euthanasia as non-live outcomes, and its definition allows rare exceptions after review. Nor does the designation, by itself, tell the public how a shelter handles medical or behavioral needs, how long animals stay, or whether the shelter has enough staff and space.
Best Friends says its broader aim is not simply to earn a designation: “The goal is for every shelter to make a clear commitment to lifesaving and transparency (being honest and open about their data and operations) while striving for no-kill rather than simply working to obtain a no-kill designation.”
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How are save rate and live release rate calculated?
The terms are not automatically interchangeable. Organizations and shelters may use different numerators, denominators, and outcome categories, so two percentages should not be compared as if they measure the same thing unless their methods match.
Best Friends’ save rate
Best Friends describes its gross save-rate calculation as:
(Live intakes − non-live outcomes) ÷ live intakes × 100
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For this calculation, non-live outcomes include euthanasia, owner-requested euthanasia, deaths in care, and animals lost in care. Best Friends counts owner-requested euthanasia when an animal is taken directly by the shelter, rather than through a public clinic.
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The ASPCA describes live release rate as:
Live outcomes ÷ intake × 100
Its live outcomes include adoptions, returns to owners, and transfers to outside agencies that guarantee adoption. The ASPCA also identifies intake, length of stay, euthanasia rate, and live release rate as useful indicators to track.
Before interpreting a shelter’s published percentage, check which species and intake streams are included; what counts as a live outcome; and how the calculation treats transfers, owner-requested euthanasia, deaths, and animals lost in care. Best Friends notes that live-release formulas vary between shelters.
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What do the latest national figures show?
The latest full-year totals in the reviewed sources are for 2025, but the figures describe different categories and should not be treated as one reconciled measure.
| Source and year | Reported figure | What it measures |
|---|---|---|
| Best Friends Animal Society, 2024 | 82% national save rate; 425,000 animals killed in U.S. shelters | Best Friends’ national estimate. Its report says nearly 3,000 shelters submitted current 2024 data; it estimated remaining figures using historical and community data. |
| Shelter Animals Count, 2025, as reported by the ASPCA on February 4, 2026 | 5.8 million community intakes; 4.2 million adoptions; 638,000 returns to owners; 757,000 non-live outcomes | National full-year estimates across the categories named by Shelter Animals Count. |
| ASPCA, 2025 estimate based on full-year data compiled by Shelter Animals Count | Approximately 597,000 animals euthanized | Euthanasias—not all non-live outcomes. The ASPCA reports this as a decrease from 2024. |
| Shelter Animals Count, 2024 | 607,000 animals euthanized: 334,000 dogs and 273,000 cats | Reported euthanasias, not the same category as all non-live outcomes. |
The 757,000 non-live outcomes reported by Shelter Animals Count for 2025 are not equivalent to the ASPCA’s approximately 597,000 euthanasias for that year: non-live outcomes include categories beyond euthanasia. The 2024 Best Friends save-rate estimate also comes from a different organization, year, and method, so it should not be directly compared with the 2025 figures as if the numbers formed a single trend.
Best Friends’ 2024 report says its dataset recorded 59% fewer pets killed in 2024 than in 2016. That is a change reported within Best Friends’ dataset; it does not, by itself, establish that the no-kill designation caused the decline. Best Friends also reported that every shelter in Vermont, New Hampshire, Delaware, and Rhode Island exceeded its 90% threshold in 2024.
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Why do people support a no-kill goal—and why do some question the label?
The case for a measurable lifesaving goal
Best Friends presents the 90% threshold as an achievable community benchmark. Its advocacy emphasizes lifesaving programs, transparency, partnerships, adoptions, and transfers, alongside reporting the remaining gap. A shared target can focus attention on preventable deaths and prompt communities to examine whether practical alternatives are available.
The concern about a threshold standing in for welfare
A rate compresses many different circumstances into one number. Shelters can differ in the animals they receive, the services they are responsible for, and the medical or behavioral needs of those animals. A percentage alone cannot explain an individual euthanasia decision or show whether a shelter’s care is adequate.
The ASPCA describes shelters facing capacity challenges, staffing and veterinary shortages, and more animals requiring specialized care. It recommends looking beyond a label to information about intake and transfers, medical and behavioral care, enrichment, euthanasia decisions, community services, transparency, and capacity for care. The reviewed sources do not establish through a controlled independent comparison that a no-kill designation causes better individual welfare, shorter stays, or higher-quality euthanasia decisions.
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What should you ask about a local shelter?
To understand what a published rate means in practice, ask for the method and the operating context behind it. Useful questions include:
- Which animals and intake streams are included in the calculation?
- What are the numerator and denominator, and how are adoptions, returns to owners, and transfers counted?
- Are euthanasia, owner-requested euthanasia, deaths in care, and animals lost in care reported separately?
- How does the shelter track length of stay, and what are its current space, staffing, and veterinary-care constraints?
- What medical and behavioral care and enrichment are available, and how are euthanasia decisions made and explained?
- How complete and current are the data? Are some figures estimates, and if so, how were they produced?
- What services help people keep pets, reunite lost animals with families, or find alternatives when a shelter cannot immediately accept an animal?
These questions do not replace a shelter’s published statistics; they put those numbers in context. When comparing two shelters, check that their definitions, data coverage, and operating responsibilities are comparable before drawing conclusions from a difference in rates.
How can communities reduce pressure on shelters?
Pressure can be reduced before an animal enters a shelter as well as through adoption and fostering. The ASPCA identifies keeping pets in loving homes, reducing adoption barriers, and reuniting lost pets with their families as ways to support animals and reduce shelter pressure. Its president and CEO, Matt Bershadker, said: “Keeping pets in loving homes, removing barriers to adoption and helping lost pets return to their families are some of the most effective ways to support animals and reduce pressure on shelters that are already operating at or beyond capacity.”
Foster programs can give animals needing more time a home setting, help shelters learn how they behave outside the facility, and expand available capacity. They require appropriate oversight and resources, however; fostering is not a substitute for a shelter’s responsibility to provide care and reach timely, appropriate outcomes. The ASPCA also describes managed admissions as a way to keep services within a shelter’s capacity for care where legal and contractual duties allow. Neither approach alone resolves overcrowding.
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- Consider adopting, fostering, or volunteering with a local shelter or rescue.
- Support efforts that help people keep pets and make adoption more accessible.
- Help lost animals get identified and reunited with their families.
- Ask local organizations how they report outcomes and what community services would address their most pressing needs.
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