Spayathon® for Puerto Rico


More than 25 organizations have come together to serve tens of thousands of animals and provide training and infrastructure for lasting change.

Puerto Rico is facing a growing animal welfare crisis: Many individuals vacated the island following devastating natural disasters in 2017 (Hurricane Maria) and 2019 (earthquakes in the Guanica region) and had to leave their pets behind, adding to the population of unowned animals—currently estimated at more than 300,000 dogs and one million cats. Zoonotic diseases like leptospirosis are spreading, posing a threat to both animal and human populations. The few veterinary resources on the island are already stretched beyond capacity. The extreme levels of poverty across the island make what veterinary resources there are inaccessible to many pet caretakers.

We responded to this crisis by establishing Spayathon® for Puerto Rico, a coalition of 28 national and international groups coming together for the first time to spay, neuter and vaccinate at least 85,000 dogs and cats across the island. Spayathon is founded on a historic agreement signed between the Humane Society of the United States, the Puerto Rico government, Veterinary Association and Veterinary Board, allowing teams of high-quality, high-volume spay/neuter veterinarians to practice on the island for the first time ever, assembling the largest coalition dedicated to mass spay/neuter efforts.

Support this lifesaving work.

Your donation will help fund a brighter future for Puerto Rico’s animals, as well as all animals suffering in puppy mills, research labs, dogfighting rings and factory farms. 

HSUS staff holding a puppy at Spayathon
Meredith Lee / The HSUS

In March of 2019, the Government of Puerto Rico announced that the HSUS would be granted six additional Spayathon rounds beyond Round 4 (held in May 2019), which will help more than 60,000 additional animals. Clinics welcome both owned and TNR/rescue animals.

February and May 2021 Canceled; Read More

Febrero y Mayo 2021 Han Sido Canceladas; Leer Más

A cat being treated by vets and techs at Spayathon for Puerto Rico
A cat being treated by vets and techs at Spayathon for Puerto Rico.
Jennifer Evans
Illume Communications
Vets and techs working with animals at Spayathon for Puerto Rico
Vets and techs working with animals at Spayathon for Puerto Rico.
James Evans
Illume Communications

Spayathon has an immediate positive impact by preventing hundreds of thousands of unwanted litters, many of which would undoubtedly contribute to the street dog and cat populations and shelter intake numbers.


  • Round 1, completed in June of 2018, altered 5,295 pets.
  • Round 2, completed in November of 2018, altered 7,722 pets.
  • Round 3, completed in February of 2019, altered 8,428 pets.
  • Round 4, completed in May of 2019, altered 8,644 pets.
  • Round 5, completed in November of 2019, altered 7,194 pets.
  • Round 6, completed in February of 2020, altered 8,298 pets.
  • All mini field clinics and vouchers (since 2018) have altered 10,713 pets.
Map depicting Spayathon locations in Puerto Rico as of round 6

Since the launch of Spayathon, and in conjunction with other HSUS-sponsored spay/neuter clinics, more than 56,000 pets have been altered and vaccinated across the island at no cost to their owners. Moreover, each of those animals was vaccinated against diseases that could pose a pressing danger to the human population, like rabies and leptospirosis. Longer term, Spayathon will provide specialized high quality, high volume, spay/neuter training, provided by the ASPCA, for approximately 100 veterinarians and technicians across the island.

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In November of 2018, the historic initiative was recognized by Clinton Global Initiative’s “Commitments to Action,” which recognizes efforts to address significant global challenges that are innovated, specific and measurable.  

All of the surgical equipment and supplies purchased in connection with Spayathon will be donated to trained veterinarians, allowing Puerto Rico to establish its own spay/neuter infrastructure for the first time. What’s more, data collected from the pet owners served during Spayathon will contribute to the knowledge base of academicians and advocates worldwide.

Volunteer for Spayathon

By the numbers
Cat in carrier at a Spayathon event

During first post-surgery year.

Spayathon vets and techs working

Of active clinics since June of 2018.

Spayathon vet and dog

Donated by surgeons, veterinary technicians and assistants.

Puerto Rico Spayathon 2019 partners

Our deepest appreciation to our in-kind supporters: 

Mars, Dechra PharmaceuticalsProject V.E.T.S. and Pet King Brands.