"Here come the hoof boot angels." That's what the people of New York might have said back in 1919, and for many years after that, when they saw Harry Moran from the Humane Society or Mrs. James Speyer from the Women's League for Animals coming down the street. He had a bag full of canvas winter hoof boots for horses with him; they were called simply "non-skids". She would have boots made of carpet, or chain treads that clipped over a horse's hooves.
Both organizations gave safety hoof gear away for free to drivers and helped put them on over the horses' calked shoes. And then they went on to the next street to help more horses get through the a slippery, snowy winter on the streets of New York.