Humane population control,
for both strays and pets.
Neutering is how PACS manages Koh Phangan's stray population humanely — not through culling, not through cruelty, but through consistent, affordable sterilisation that keeps numbers stable generation by generation.
How the programme works
Between 2001 and 2017, PACS neutered 5,802 animals — dogs and cats, male and female, stray and owned. Female dogs account for the largest share at 47% of all neuters, followed by female cats at 24%. Prioritising females has the highest impact on population growth, though male animals are also sterilised as part of each campaign.
The monthly target is 30 neuters as a minimum. With a full-time vet in post, that rises to 60. The programme runs year-round — not just in intensive bursts — because population management only works when it is sustained.
Programme figures
Monthly target (minimum)
30 neuters
Monthly target (full-time vet)
60 neuters
Monthly programme cost
approx. THB 30,000
5-day intensive project cost
approx. THB 150,000
Cost per neuter (approx.)
THB 1,000 including aftercare
Periodically, PACS runs 5-day intensive neutering projects in collaboration with visiting veterinary teams — these allow a higher volume of procedures in a short period, and are especially effective for reaching animals in more remote parts of the island.
Partner organisations
PACS works alongside other organisations on population management in the region. These partnerships allow for shared expertise, joint campaigns, and referrals when the right care isn’t available locally.
- Lanta Animal Welfare — Koh Lanta, southern Thailand. Joint neutering campaigns and shared veterinary expertise.
- AWARE — Animal Welfare Advocates for Responsible Ethics. Regional advocacy and clinical support.
- Vets Beyond Borders — International veterinary volunteers who join PACS for intensive neutering projects, supplementing local staff capacity.
Sterilisation that never stops.
One donation of THB 1,000 funds one full neutering procedure, including aftercare. Every procedure is one fewer litter, one fewer animal growing up on the street with no care and no future.