If you are serious about offering the pay for spay services, contact Mike De Shield at <deshield@btl.net> He is an excellant vet based in Belizecity and tried to run a clinic twice monthly on weekends in San Pedro, but couldn't realy blance that along with everything else he does. He could certainly travel out to SP for spaying clinics, as he does in Placencia for the Humane Society there.
You don't have other options really as there isn't another vet licensed to practice on the entire island, so best to contact Mike and see what you can arrange with him.
I've used him for all my animals (and myself) for many many years and he's just wonderful, a first rate doc. He can do it.
Katie Valk
Maya Travel Services