This could be a very interesting journey. I work at Dover Saddlery. I love it. It gives me access to all manner of horse items. If we don't carry it, I can walk across the hall and talk to the buyer to find out how I might find that which I need. However. With all that, and as mentioned,  with the amazing help of vendors going above and beyond to help, I could not get a hoof boot to fit our 17.3 draft, with bad feet ( I have mentioned in previous blogs.). No one believes me when I say that his feet, when measured across are over 8". We even special ordered the largest boot Cavallo had, and even that was so small he couldn't even get his toe in it. Size 10.
I know you are probably saying he needs a trim. BUT NO! We have an amazing barefoot trimmer (Pat Zigelhofer) who has been keeping my horses sound for years. The past couple, however seem to have been rough ones for our big boy.
Since I am unable to access a commercial boot large enough, I thought I might try and juryrig something. One of our wonderful buyers at Dover, Lisa Imperato, who was also instrumental in the above mentioned search, gave me a template. It was their largest size and of course was way too small for Cup.
So, here we go, Template in hand. I am going to try and construct a horse boot out of an ole pair of leather chaps. We shall see how this all pans out. I remember reading, years ago, about how the Indians used to put leather boots on their horses to muffle the sound when they wanted to sneak up on another tribe.  Googling came up with "nothin' ".