They do provide those services but they're expensive. I asked how much it would cost to spay my female pitbull & it was $800 here. There are other places around SD that do it for a fraction of that. If you're low income, the humane society provides that service for around $100 depending on the weight of your animal. However, because of covid, they're not currently taking those appointments. They do provide a list of vets that can perform the service though. Its on their website.
They do spay and neuter and their prices are very reasonable.
Thanks! Your answer is awaiting moderation.