The largest "humane society" of the USA, the HSUS, has a philosophy that animals shouldn't really even be pets or zoo exhibits, but it is grudgingly tolerated for the better good of the critters. They try to do with honey what PETA tries to do with vinegar, but it's crazy in both cases. The ASPCA is a much more reliable and pet-friendly organization. Local "humane societies" may also not share the anti-pet views of the HSUS.
The ASPCA has some great, practical people working for it in GA and SC. We’ve called them more than once to report conditions that we’ve seen horses kept in.
An off-topic correction: the HSUS doesn’t really want to tolerate even pet ownership. They are not just anti-zoo and anti-meat, but also anti-human contact. A quote from Wayne Pacelle, the president of the HSUS: “One generation and out,” he says, meaning that we should stop all production of domestic animals. The pets should be allowed to die off and not be replaced. No guide dogs, no companion cats, no ponies for kids, no trail-riding for me and my horse, no human-animal contact. If they can’t survive in the wild on their own, like my min-pin, that’s too bad, according to Wayne. And Wayne is working with a ONE HUNDRED MILLION DOLLAR annual budget to pay lobbyists so he can get his agenda passed. Much of that budget comes from the contributions of well-meaning people who think they’re giving donations that will help animals. Just the opposite is true.