It’s not uncommon for a farrier to medicate a horse. Some horses oblige & pick feet up. Some, despite training, will never act appropriately. Younger horses, especially. It terrifies them to get shoes, the first time. MOO
Also, imo, any of us with cattle or large farm animals tend to have meds on hand. Things happen, a vet isn’t always available. After establishing a relationship with a vet, in my neck of the woods, we call & tell him what we need & it’s ready to be picked up on the next trip to town. However, narcotics would be off limits. But, if someone has an injured horse, they may need to medicate it for days/weeks, so there’s alway a possibility a rancher has available meds. Personally, I don’t see K being injected.
MOO MOO