Banding Horny Stray Dogs

There are a boatload of stray dogs in Georgia, they are just all over the place including a pack right by my house. I have to give them credit as they are very sweet, not too scared, not mean, starved for attention (kinda heart breaking actually) and horny...

For whatever reason I see almost no females around, the vast majority of the strays are males. This makes a female in heat a target for the always-ready-to-rock-their-libido males and every once in a while I will hear an insane frenzy of barking and whimpering etc and i have come to learn that quite often it is the males chasing the females that are in heat. This country completely does not need more strays (no country does) so it makes me wish there was some easy way to castrate these dogs.

When I worked on a beef herd operation we did a combination of surgical and banding castrations. Being a guy I always cringed a bit for my fellow males but asides from the initial fight they put up they seemed amazingly undisturbed immediately after being deprived of their jewels. I tried looking on the internet for banding dogs and all I could find was a few seemingly innocent posts asking about banding of dogs and a frenzy of posts condemning the individual, though no hard facts about it. I did notice (in the link i gave above for livestock) that the three ways listed were surgical, hormonal, and chemical. I wonder if there is some chemical or hormonal type castration out there for dogs?