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Private foundations don’t post open calls, so nobody can search them. We read IRS filings instead — 9.6 million grants from 174,053 foundations and grantmaking charities, searchable by what the money was actually for.

12 funders with a record of paying for “neuter”

Where the money went

1.0×
Petsmart Charities Inc → Pets Low Cost Spay and Neuter Clinic: $1.2M across 4 grants, latest 2024The Humane Society of the United States → Bethel Friends of Canines: $677K across 4 grants, latest 2024Federation of Humane Organizations of West Virginia → Spay Neuter Incentive Program of West Virginia: $600K across 1 grant, latest 2024Humboldt Area Foundation → Humboldt Humane: $240K across 1 grant, latest 2024The Peterman Foundation Inc → Pet Helpers Inc: $230K across 4 grants, latest 2025Community Foundation of North Texas Inc → Spay Neuter Network: $214K across 6 grants, latest 2024Petrie Margaret Spaying & Neutering → Animal Protection Society of Durham: $130K across 3 grants, latest 2024Arkansas Animal Rescue Foundation → Friends of Kitties & Kanines: $87K across 3 grants, latest 2025Knopf Family Foundation Inc → Humane Society of the Treasure Coast Inc: $80K across 2 grants, latest 2025Florida Animal Friend Inc → Wags Pet Clinic: $50K across 2 grants, latest 2024Bissell Pet Foundation → Detroit Dog Rescue: $20K across 1 grant, latest 2023Thornton S Jr and Katrina D → Sakrescue: $18K across 3 grants, latest 2024The Humane Society of the United States → Leech Lake Band of Ojibwe: $610K across 4 grants, latest 2024Petsmart Charities Inc → Community Spay Neuter Initiative Partnership C-Snip: $600K across 2 grants, latest 2024Federation of Humane Organizations of West Virginia → Wv Dept of Agriculture - Wv Snp Fund: $450K across 1 grant, latest 2022The Peterman Foundation Inc → Mountaineer Spay Neuter Assist Pro: $213K across 4 grants, latest 2025Humboldt Area Foundation → Humboldt Spayneuter Network: $139K across 2 grants, latest 2022Petrie Margaret Spaying & Neutering → Independent Animal Rescue: $129K across 3 grants, latest 2024Community Foundation of North Texas Inc → Saving Hope Foundation: $117K across 3 grants, latest 2024Arkansas Animal Rescue Foundation → Paws & Claws Humane Society: $85K across 3 grants, latest 2025Knopf Family Foundation Inc → Humane Soc of St Lucie County: $58K across 2 grants, latest 2025Florida Animal Friend Inc → Santa Rosa County Animal Services: $50K across 2 grants, latest 2024Bissell Pet Foundation → De Dierenbescherming: $20K across 2 grants, latest 2023Thornton S Jr and Katrina D → Spay Neuter Imperative Project California (Aka Snip Bus): $16K across 3 grants, latest 2024The Humane Society of the United States → The Blackfeet Tribe of the Blackfeet Nation: $545K across 4 grants, latest 2024Petsmart Charities Inc → Spay Neuter Project of Los Angeles Inc: $510K across 2 grants, latest 2022Federation of Humane Organizations of West Virginia → Help for Animals Inc: $420K across 3 grants, latest 2025The Peterman Foundation Inc → Animal Friends of North: $180K across 3 grants, latest 2025Petrie Margaret Spaying & Neutering → Safe Haven for Cats: $125K across 3 grants, latest 2024Humboldt Area Foundation → Public Vet - Neuter Scooter: $119K across 4 grants, latest 2024Arkansas Animal Rescue Foundation → Companions Spay and Neuter Clinic: $64K across 3 grants, latest 2025Knopf Family Foundation Inc → Humane Soc of Florida Pompano Fl: $55K across 2 grants, latest 2025Florida Animal Friend Inc → St Augustine Humane Society: $47K across 2 grants, latest 2024Community Foundation of North Texas Inc → Panther City Feral Cat Coalition: $20K across 3 grants, latest 2024Bissell Pet Foundation → Alaska Native Rural Veterinary Inc: $14K across 1 grant, latest 2023Thornton S Jr and Katrina D → Siskiyou Spay Neuter Incentive Program: $13K across 2 grants, latest 2023The Humane Society of the United States → Auburn Valley Humane Society: $411K across 4 grants, latest 2024The Humane Society of the United States → Seattle Humane: $400K across 3 grants, latest 2024The Humane Society of the United States → Idaho Humane Society Inc: $341K across 3 grants, latest 2023The Humane Society of the United States → Wisconsin Humane Society: $306K across 4 grants, latest 2024The Humane Society of the United States → Animal Shelter of Wood River Valley Inc Dba Mountain Humane: $295K across 4 grants, latest 2024The Humane Society of the United States → Shoshone-Paiute Tribes: $292K across 2 grants, latest 2024The Humane Society of the United States → Minn-Kota Paaws: $260K across 3 grants, latest 2024The Humane Society of the United States → County of Ventura Dba Ventura County Animal Services: $256K across 1 grant, latest 2022The Humane Society of the United States → Quinault Indian Nation: $250K across 2 grants, latest 2024The Humane Society of the United States → Friends of the Shelter Dba Better Together Animal Alliance: $210K across 3 grants, latest 2024The Humane Society of the United States → Altus Animal Welfare Association: $175K across 1 grant, latest 2021Federation of Humane Organizations of West Virginia → Berkeley Humane: $166K across 1 grant, latest 2024Federation of Humane Organizations of West Virginia → Spay Neuter Incentive Program: $155K across 1 grant, latest 2025Federation of Humane Organizations of West Virginia → Berkeley County Humane Society: $155K across 1 grant, latest 2022The Humane Society of the United States → Lac Du Flambeau Band of Lake Superior Chippewa Indians: $150K across 1 grant, latest 2024Petsmart Charities Inc → Alabama Spay Neuter Clinicincorporated: $150K across 1 grant, latest 2021Petsmart Charities Inc → St Louis Metropolitan Spay Neuter & Wellness Clinic Inc: $150K across 1 grant, latest 2021Federation of Humane Organizations of West Virginia → Charleston Regional Spay Neuter Center Inc: $150K across 1 grant, latest 2024Federation of Humane Organizations of West Virginia → Fixem Operating: $150K across 1 grant, latest 2022Federation of Humane Organizations of West Virginia → Humane Society of Parkersburg Spot Clinic: $150K across 1 grant, latest 2022Federation of Humane Organizations of West Virginia → Charleston Regional Spay Neuter: $150K across 1 grant, latest 2025Federation of Humane Organizations of West Virginia → Snip Wv: $150K across 1 grant, latest 2022Petsmart Charities Inc → Wiregrass Spay Neuter Alliance: $150K across 1 grant, latest 2021Federation of Humane Organizations of West Virginia → Critter Connection Clinic: $145K across 1 grant, latest 2025Federation of Humane Organizations of West Virginia → Berkeley County Humne Society: $143K across 1 grant, latest 2025Federation of Humane Organizations of West Virginia → Humane Society of Parkersburg Wv: $143K across 1 grant, latest 2025Federation of Humane Organizations of West Virginia → Humane Society of Parkersburg West Virginia: $143K across 1 grant, latest 2024The Humane Society of the United States → Friends of the Shelter Dba Panhandle Animal Shelter: $130K across 1 grant, latest 2021The Humane Society of the United States: $5.3M on this topic. Open the funder.The Humane Society of the Uni…$5.3MFederation of Humane Organizations of West Virginia: $3.3M on this topic. Open the funder.Federation of Humane Organiza…$3.3MPetsmart Charities Inc: $2.8M on this topic. Open the funder.Petsmart Charities Inc$2.8MThe Peterman Foundation Inc: $623K on this topic. Open the funder.The Peterman Foundation Inc$623KHumboldt Area Foundation: $499K on this topic. Open the funder.Humboldt Area Foundation$499KPetrie Margaret Spaying & Neutering: $384K on this topic. Open the funder.Petrie Margaret Spaying & Neu…$384KCommunity Foundation of North Texas Inc: $350K on this topic. Open the funder.Community Foundation of North…$350KArkansas Animal Rescue Foundation: $236K on this topic. Open the funder.Arkansas Animal Rescue Founda…$236KKnopf Family Foundation Inc: $193K on this topic. Open the funder.Knopf Family Foundation Inc$193KFlorida Animal Friend Inc: $147K on this topic. Open the funder.Florida Animal Friend Inc$147KBissell Pet Foundation: $54K on this topic. Open the funder.Bissell Pet Foundation$54KThornton S Jr and Katrina D: $47K on this topic. Open the funder.Thornton S Jr and Katrina D$47KPets Low Cost Spay and Neuter Clinic: received $1.2M on this topicPets Low Cost Spay and Neuter C…$1.2MBethel Friends of Canines: received $677K on this topicBethel Friends of Canines$677KLeech Lake Band of Ojibwe: received $610K on this topicLeech Lake Band of Ojibwe$610KSpay Neuter Incentive Program of West Virginia: received $600K on this topicSpay Neuter Incentive Program o…$600KCommunity Spay Neuter Initiative Partnership C-Snip: received $600K on this topicCommunity Spay Neuter Initiativ…$600KThe Blackfeet Tribe of the Blackfeet Nation: received $545K on this topicThe Blackfeet Tribe of the Blac…$545KSpay Neuter Project of Los Angeles Inc: received $510K on this topicSpay Neuter Project of Los Ange…$510KWv Dept of Agriculture - Wv Snp Fund: received $450K on this topicWv Dept of Agriculture - Wv Snp…$450KHelp for Animals Inc: received $420K on this topicHelp for Animals Inc$420KAuburn Valley Humane Society: received $411K on this topicAuburn Valley Humane Society$411KSeattle Humane: received $400K on this topicSeattle Humane$400KIdaho Humane Society Inc: received $341K on this topicIdaho Humane Society Inc$341KWisconsin Humane Society: received $306K on this topicWisconsin Humane Society$306KAnimal Shelter of Wood River Valley Inc Dba Mountain Humane: received $295K on this topicAnimal Shelter of Wood River Va…$295KShoshone-Paiute Tribes: received $292K on this topicShoshone-Paiute Tribes$292KMinn-Kota Paaws: received $260K on this topicMinn-Kota Paaws$260KCounty of Ventura Dba Ventura County Animal Services: received $256K on this topicCounty of Ventura Dba Ventura C…$256KQuinault Indian Nation: received $250K on this topicQuinault Indian Nation$250KHumboldt Humane: received $240K on this topicHumboldt Humane$240KPet Helpers Inc: received $230K on this topicPet Helpers Inc$230KSpay Neuter Network: received $214K on this topicSpay Neuter Network$214KMountaineer Spay Neuter Assist Pro: received $213K on this topicMountaineer Spay Neuter Assist…$213KFriends of the Shelter Dba Better Together Animal Alliance: received $210K on this topicFriends of the Shelter Dba Bett…$210KAnimal Friends of North: received $180K on this topicAnimal Friends of North$180KAltus Animal Welfare Association: received $175K on this topicAltus Animal Welfare Association$175KBerkeley Humane: received $166K on this topicBerkeley Humane$166KSpay Neuter Incentive Program: received $155K on this topicSpay Neuter Incentive Program$155KBerkeley County Humane Society: received $155K on this topicBerkeley County Humane Society$155KLac Du Flambeau Band of Lake Superior Chippewa Indians: received $150K on this topicLac Du Flambeau Band of Lake Su…$150KAlabama Spay Neuter Clinicincorporated: received $150K on this topicAlabama Spay Neuter Clinicincor…$150KSt Louis Metropolitan Spay Neuter & Wellness Clinic Inc: received $150K on this topicSt Louis Metropolitan Spay Neut…$150KCharleston Regional Spay Neuter Center Inc: received $150K on this topicCharleston Regional Spay Neuter…$150KFixem Operating: received $150K on this topicFixem Operating$150KHumane Society of Parkersburg Spot Clinic: received $150K on this topicHumane Society of Parkersburg S…$150KCharleston Regional Spay Neuter: received $150K on this topicCharleston Regional Spay Neuter$150KSnip Wv: received $150K on this topicSnip Wv$150KWiregrass Spay Neuter Alliance: received $150K on this topicWiregrass Spay Neuter Alliance$150KCritter Connection Clinic: received $145K on this topicCritter Connection Clinic$145KBerkeley County Humne Society: received $143K on this topicBerkeley County Humne Society$143KHumane Society of Parkersburg Wv: received $143K on this topicHumane Society of Parkersburg Wv$143KHumane Society of Parkersburg West Virginia: received $143K on this topicHumane Society of Parkersburg W…$143KHumboldt Spayneuter Network: received $139K on this topicHumboldt Spayneuter Network$139KAnimal Protection Society of Durham: received $130K on this topicAnimal Protection Society of Du…$130KFriends of the Shelter Dba Panhandle Animal Shelter: received $130K on this topicFriends of the Shelter Dba Panh…$130KIndependent Animal Rescue: received $129K on this topicIndependent Animal Rescue$129KSafe Haven for Cats: received $125K on this topicSafe Haven for Cats$125KPublic Vet - Neuter Scooter: received $119K on this topicPublic Vet - Neuter Scooter$119KSaving Hope Foundation: received $117K on this topicSaving Hope Foundation$117KFriends of Kitties & Kanines: received $87K on this topicFriends of Kitties & Kanines$87KPaws & Claws Humane Society: received $85K on this topicPaws & Claws Humane Society$85KHumane Society of the Treasure Coast Inc: received $80K on this topicHumane Society of the Treasure…$80KCompanions Spay and Neuter Clinic: received $64K on this topicCompanions Spay and Neuter Clin…$64KHumane Soc of St Lucie County: received $58K on this topicHumane Soc of St Lucie County$58KHumane Soc of Florida Pompano Fl: received $55K on this topicHumane Soc of Florida Pompano Fl$55KWags Pet Clinic: received $50K on this topicWags Pet Clinic$50KSanta Rosa County Animal Services: received $50K on this topicSanta Rosa County Animal Servic…$50KSt Augustine Humane Society: received $47K on this topicSt Augustine Humane Society$47KDetroit Dog Rescue: received $20K on this topicDetroit Dog Rescue$20KDe Dierenbescherming: received $20K on this topicDe Dierenbescherming$20KPanther City Feral Cat Coalition: received $20K on this topicPanther City Feral Cat Coalition$20KSakrescue: received $18K on this topicSakrescue$18KSpay Neuter Imperative Project California (Aka Snip Bus): received $16K on this topicSpay Neuter Imperative Project…$16KAlaska Native Rural Veterinary Inc: received $14K on this topicAlaska Native Rural Veterinary…$14KSiskiyou Spay Neuter Incentive Program: received $13K on this topicSiskiyou Spay Neuter Incentive…$13K
12 funders, 64 recipients, grants matching “neuter” only. Ribbon width is proportional to the total given; each funder has its own colour (smaller funders in gray). Hover a name to isolate its flows, click a funder to open it. Drag to move around; zoom with the buttons, a double-click, or the wheel after clicking the map.

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Source: IRS Form 990-PF Part XV and Form 990 Schedule I, tax years 2019–2025. These are grants already paid, a record of what an organization funds rather than an open call. Private foundations rarely accept unsolicited applications and the route in is usually a program officer; grantmaking charities and associations more often run real application cycles, so check their website. How this data is built, and its limits →