I have different areas and those cootain different grasses. Most of my grass is tallish. The actual grass blades reahing about a foot or so. There are also areas where the grass is short because the horses have eaten it down, or because it just doesn't grow as tall. This is in a pasture that essentally has irrigated pasture.
I found it interesting the other day to find my horses (not the IR pony) grazing in my neighbors unirrigated pasture that has what we call cheat grass when my irrigated hay field grass is very green and nice looking.