Pet fostering is a major part of the U.S. animal-welfare system, especially for rescue organizations that rely on private homes instead of permanent facilities. The 2024 national foster-based rescue analysis from Shelter Animals Count covered 13,527 organizations and found meaningful differences in adoption rates, intake patterns, and length of stay between foster-based rescues and brick-and-mortar shelters.
Contents
- The national foster-care picture
- Adoption rates and foster-program performance
- How long foster animals wait for adoption
- Who enters foster-based rescues
- Dog breed and age statistics
- When foster activity is busiest
The national foster-care picture
Shelter Animals Count’s 2024 analysis included 4,110 shelters and 9,417 foster-based organizations across all 50 U.S. states. Together, the national dataset used for the foster-based rescue analysis represented an estimated 5.8 million community intakes and 1.2 million transfers. The animal mix included an estimated 3.4 million cats and 3.6 million dogs.
Foster-based rescues handled 15% of community intakes nationally, while brick-and-mortar shelters handled the remaining 85%. That share shows that foster organizations are a smaller part of the total intake system, but their role is not limited to the animals that arrive directly from the community. Transfers are a particularly important pathway into foster care.
Across transfers into foster-based rescues, 68% came from brick-and-mortar shelters. Other rescues supplied 18% of dog transfers and 13% of cat transfers. Other sources, including clinics, boarding facilities, and community service providers, supplied 13% of dog transfers and 19% of cat transfers. These percentages describe the transfer sources reported in the foster-based rescue analysis; they are not a count of every animal entering foster care.
The broader Shelter Animals Count 2024 annual report recorded 1,189,000 transfers in overall sheltering data. It recorded 1.2 million adoptions in that overall data, compared with 881,000 adoptions in 2023 and 959,000 in 2024 in the reported comparison figures. Because these figures refer to overall sheltering data, they should not be treated as foster-rescue-only totals.
Adoption rates and foster-program performance
The clearest contrast in the foster-based rescue analysis is the adoption rate. Foster-based rescues reported a 75% adoption rate, compared with 56% for brick-and-mortar shelters. For dogs, the foster-based rescue adoption rate was 80%, versus 50% in shelters. For cats, the corresponding rates were 75% for foster-based rescues and 61% for shelters.
| Reported group | Adoption rate |
|---|---|
| Foster-based rescues, all animals | 75% |
| Brick-and-mortar shelters, all animals | 56% |
| Foster-based rescues, dogs | 80% |
| Brick-and-mortar shelters, dogs | 50% |
| Foster-based rescues, cats | 75% |
| Brick-and-mortar shelters, cats | 61% |
The comparison indicates that foster placement is associated with stronger adoption outcomes in this analysis, but an adoption rate is not a guarantee for an individual animal. Intake mix, available foster homes, medical needs, behavior, geography, and adoption policies can all affect an organization’s results. The source reports comparative rates; it does not establish that fostering alone caused every difference.
Best Friends also reported a relationship between foster involvement and adoption outcomes. In its analysis of organizations, shelters and rescue groups without foster programs adopted out 48% of animals in their care on average. Organizations with some level of foster involvement adopted out 68% on average. Organizations that allowed foster caregivers to process adoptions averaged a 77% adoption rate.
Best Friends described foster programs as capable of producing a 20 percentage point adoption-rate boost over having no foster program. The Best Friends foster-program analysis surveyed nearly 650 network partners for its 2026 analysis. The 20-point figure is a reported comparison, not a forecast for every rescue or a promise of a specific result.
A separate Best Friends fostering survey included 321 foster families. In that survey, 58% said they were unlikely to adopt their current foster animal. Also, 95% said they had already facilitated an adoption or were comfortable working directly with prospective adopters. Together, those figures suggest that fostering does not always end in a permanent adoption by the caregiver and that many foster families participate in the adoption process itself.
How long foster animals wait for adoption
Shelter Animals Count reported a national median length of stay to adoption of 16 days for dogs and 20 days for cats. A median is the midpoint of the reported distribution: it describes the typical central experience more reliably than an average when some animals stay much longer than others.
The foster-based rescue sample also reported different 2024 medians by intake category. For dogs, transfer-in animals had a 52-day median length of stay to adoption. Owner-surrender dogs had a 56-day median, stray dogs had a 66-day median, and dogs in the other-intake category had a 78-day median.
Cats showed a different ordering. Transfer-in cats had a 55-day median length of stay to adoption. Owner-surrender cats had a 51-day median, stray cats had a 54-day median, and cats in the other-intake category had a 72-day median.
| Intake category | Dogs | Cats |
|---|---|---|
| Transfer-in | 52 days | 55 days |
| Owner surrender | 56 days | 51 days |
| Stray | 66 days | 54 days |
| Other intake | 78 days | 72 days |
In the foster-based rescue sample, dog length of stay to adoption fell by 12 days year over year for the owner-surrender intake category. The supplied report does not provide a comparable year-over-year change for each other category, so the 12-day change should not be generalized to all foster dogs or cats.
The category figures are medians for the 2024 foster-based rescue sample, while the 16-day and 20-day figures are national medians reported for dogs and cats. Keeping those scopes separate matters: the category table should be read as a more detailed view of the foster-rescue sample, not as a replacement for the national figures.
Who enters foster-based rescues
Dogs made up 65% of transfers into foster rescues. Among dogs transferred in, 69% were adults or seniors and 31% were puppies. Cats had a different age distribution: 53% of transferred cats were adults or seniors and 47% were kittens.
These figures show that transferred animals are not primarily puppies or kittens. Adult and senior animals accounted for the larger share in both reported species groups, with the difference especially pronounced among dogs. For foster coordinators, the age mix is relevant because it describes the population needing homes, but it does not measure the care needs or adoption prospects of any particular animal.
The transfer-source breakdown adds context. Brick-and-mortar shelters were the source of 68% of transfers into foster-based rescues. For the remaining source categories, other rescues accounted for 18% of dog transfers and 13% of cat transfers, while other sources accounted for 13% of dog transfers and 19% of cat transfers. The source categories are reported separately by species and should not be added together as though they were one shared percentage distribution.
Dog breed and age statistics
Among dogs transferred into foster-based rescues, 79% carried a single-breed label and 21% were labeled mixed breed. These labels describe how the dogs were classified in the reported dataset; they are not genetic test results.
Chihuahua was the most common single-breed label, accounting for 11.5% of transferred-in dogs. Labrador Retriever and American Pit Bull Terrier each accounted for 5.7%. German Shepherd accounted for 3.6%, Alaskan Husky for 3.1%, and Great Pyrenees for 2.2%.
The remaining reported single-breed labels were American Staffordshire Terrier at 2.0%, Beagle at 1.8%, Shih Tzu at 1.7%, and Siberian Husky at 1.6%.
| Single-breed label | Share of transferred-in dogs |
|---|---|
| Chihuahua | 11.5% |
| Labrador Retriever | 5.7% |
| American Pit Bull Terrier | 5.7% |
| German Shepherd | 3.6% |
| Alaskan Husky | 3.1% |
| Great Pyrenees | 2.2% |
| American Staffordshire Terrier | 2.0% |
| Beagle | 1.8% |
| Shih Tzu | 1.7% |
| Siberian Husky | 1.6% |
The listed breed-label percentages are not intended to total 100%. The dataset also included the 21% of dogs labeled mixed breed, and it reported additional single-breed labels beyond those listed here. The figures are most useful for showing which labels appeared most often among the reported transferred-in dogs.
When foster activity is busiest
Foster-based rescue intakes peaked between April and August. Adoptions peaked in July and December. This pattern means the busiest intake period and the reported adoption peaks do not occur in exactly the same months.
For dogs, intakes and outcomes remained relatively stable year-round in foster-based rescues. At the same time, dog adoptions showed a distinct winter peak. The report therefore describes a relatively steady annual flow for dogs alongside a seasonal increase in dog adoptions during winter.
The timing statistics can help explain why foster capacity matters throughout the year. A rescue may receive its highest volume of foster-based intakes from spring through late summer, while adoption activity can have separate peaks in midsummer, December, or winter for dogs. These are reported seasonal patterns from the foster-based rescue analysis, not a schedule that every organization will experience.
For readers considering fostering, the national figures provide context rather than a personal outcome guarantee. In the 2024 analysis, foster-based rescues had higher reported adoption rates than brick-and-mortar shelters, and the detailed foster-rescue sample showed different median waits by species and intake category. The Best Friends survey also found that 58% of surveyed foster families were unlikely to adopt their current foster animal, while 95% had already facilitated an adoption or felt comfortable working directly with prospective adopters. Those numbers place the foster role between temporary care and active participation in finding an animal’s next home.