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The euthanasia medication most vets use is pentobarbital, a seizure medication. In large doses, it quickly renders the pet unconscious. It shuts down their heart and brain functions usually within one or two minutes. It is usually given by an IV injection in one of their legs.
–4 votes
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Once administered, your dog will become unconscious incredibly quickly. The brain will stop functioning after just a few seconds and, because the brain works the heart and lungs, within about 20-40 seconds your dog will stop breathing and their heart will stop beating.
+6 votes
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Once administered, your dog will become unconscious incredibly quickly. The brain will stop functioning after just a few seconds and, because the brain works the heart and lungs, within about 20-40 seconds your dog will stop breathing and their heart will stop beating.

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