long slender legs — equivalent to walking round on your fingers ==> it is i thnk to do with nature of the break and the economies of it – a race horse, whilst a valuable asset isnt likely to race again, so less liklely to get fixed up (unless it is a valuable stud animal). I have seen plenty of animals in casts but only for minor breaks – and operating on a horse soon mounts up in terms of fees – its really easy to run up 4-5k bills without even getting anywhere.
seen plenty of horses euthanized – depends where, usually a bolt but have seen a rifle used – one thing is for sure they dont half kick!!
(I’ve run anatomy classes for vet students as well as been to abbatoirs to collect clinical material for vetinary research – thankfully dont do that anymore – redundancy and an allergy to the old nags!)