How is euthanasia performed?

The most common form of euthanasia for most animals is through direct injection of an intravenously given barbiturate drug called pentobarbitone. In effect, the veterinarian is giving the animal an overdose of veterinary anesthetic.

As soon as the drug enters the animal’s blood stream, it acts immediately to suppress heart and brain functions, resulting in instant loss of consciousness and pain sensation, basically putting the animal into a deep sleep.

At the same time, the heart also stops beating, so the animal passes from a deep sleep into death without regaining consciousness or feeling any pain.