Or, A Trotter is a Trotter of course, of course.
Take a look at my presentation on 19th century trotting horses for ASEH 2019 Tweets here.
The full ASEH 2019 Tweets program is here.
Mr. Ed, aka Bamboo Harvester, would have been called (unsurprisingly) a saddle-horse, not a trotter. He was, however, descended (like many American Saddlebreds) from a number of trotters, including Hambletonian 10 discussed in the presentation.