Horses should not experience soreness in their feet after trimming. Throughout my 11 years of barefoot trimming my own horses and those of my friends, I have never encountered a single instance where they were sore afterward. Even when horses have steel shoes nailed on, they should not be sore. While I have occasionally heard of a “hot nail” situation, where a farrier accidentally places a nail too close to the sensitive laminae, it has never occurred with my horses during the ten years prior to my learning barefoot trimming. Therefore, I apologize for not being able to provide a comprehensive answer to your question, as my horses have never experienced soreness after trimming. If I were in your situation, I would suggest keeping the horses on soft grass or bedding and refraining from working them until the hoof has sufficiently grown out. Additionally, I would recommend finding a more skilled professional who can trim the hooves without causing soreness to the horse.