There are two different organizations in the Lakeside area who offer free spay neuter clinics several times a year. There are many expat volunteers manning those clinics. You skills as a vet tech, with grooming, and the fact that you speak Spanish would make you a valuable volunteer at these clinics. I have served as a team leader in the registration area of these clinics for the past couple of years. I’ve found the clinics to be one of the most rewarding activities in which I’ve been involved. We need truly bilingual volunteers to work with registration.The two organizations are Operación Amor (operates in the Chapala municipality) and Tails of Mexico (operates in the Jocotepec municipality).
I also volunteer teaching English once a week to high school and university students who are scholarship recipients in the Pathways program that was founded a few years ago by Pat Baxter.
There are many volunteer opportunities here for someone like you. Working for wages is another thing; one must have a permanente visa (vs. a temporal visa or a tourist permit) in order to work. If you hold a temporal visa, then you must obtain a separate permission to work from Mexican immigration (INM).