In the toy soldier side of our hobby, some of the newer-makers have issued some very nice cavalry in the past 7 years or so. Britains, King & Country and Frontline come to mind, with both Imperial German in field gray, 1914 and in the later uniforms with Stahlhelm; and British/Commonwealth (incl. Australian lighthorsemen in Palestine); and French, 1914 and circa 1916. I think they all even included at least one figure apiece, depicting a rider and horse rigged for gas attacks.
Prost!
Brad