When we euthanized our little dog, and when the vet injected the drug, our dog started screaming in pain and terror, and tried to get away. It lasted for 5 seconds. This was a much different reaction then previous times when we had to euthanize our pets, where they just slipped away peacefully and quietly. We were shocked by the way our dog reacted, screaming and in terror, then stiffening. I felt guilty because instead of passing on peacefully, he was in pain and terror. Are you sure this is a "painless" way to euthanize our pets?