I have found that my 14'3" short cannoned bone pony does well with the full length, but 4" wide wraps instead of 5". I actually order him custom ones from a seller on ebay. The pony length and width are just slightly too short, but the horse sized ones make him look like he's wearing diapers on his legs.
If you don't like something, change it. If you can't change it, change your attitude.
~ Maya Angelou
Hmm. See, I'd just put one on the pony - maybe a hind leg because they can be longer- and when I got to the end -or where I would like it to end- measure that extra bit and then cut that length off the other end.