I hadn't realised until this last year that many historical novelists don't have even a nodding acquaintance with the world of horses. While to me it's very easy to visualise how the world looked and behaved when only horses were the fastest means of transport, clearly this aspect of life is - ehem - a closed book for many writers.
I had also forgotten that I have been collecting equine trivia from across history since I first created the Fell Pony Museum web site back in 2000. It's been up there on t'interweb for 13 years, waving gently at passers-by, but not making a nuisance of itself. You can Google "Fell pony history" and the Museum site will appear in the first half-dozen entries on page 1 (and: I manage two of the other sites that are up in that bracket!).
Since the concept of pedigree farm animal breeds didn't emerge in England till the 19th century, much of what I've recorded in the Museum site is generic British pony (horse) information. By definition, "Fell pony history" is not really available before then, but a good deal of information can be found about the animals who were of similar size, use and geographical distribution. So, when questions of colour, type, size, use and behaviour arise among my fellow authors, this site is a useful resource. There is a also long list of links to further reading.
This blog, Jackdaw E Books, also has several posts about horse use, and coaches and carriages, which could save much writerly embarrassment at the book reviewing stage!
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MM Bennetts' Literary Historical Fiction blog and Jonathan Hopkins' Cavalry Tales blog frequently offer terrific insights into the world of horse usage. Both are riders and Jonathan is a professional saddle fitter.
Sue Millard is the author of several equestrian books including Hoofprints in Eden, Coachman and One Fell Swoop, and two children's educational activity books, Fell Facts and Fell Fun.