I stated I believed it was painful. I have had over the years, due to horses age , guts failing, old dying horses euthed. THe horse I saw in PAIN had been tranked, had the full kill dose. THis horse when it hit the ground, tried to rise, curled her legs up bought her head and neck and it was awful. The horses nostrils were flared , it Moaned , Now it was not like 5 or 10 minutes went by, it was probably within one or two minutes, but that horse was in pain . It still Haunts me. Maybe the VEt had done something wrong, but with the full dose that horse felt it. One VEt did not admin enuf on a huge draft, and that horse had to have a second full dose, and it did not show as much pain as the mare , but the facial expression on the Draft was awful also.