Even though a majority of the shelters in the state use euthanasia by injection, several still use outdated, inhumane gas chambers. Shelter workers overwhelmingly wish to hold and comfort a frightened animal in its final moments of life. That act may be the only kindness the animal has ever known.
Carbon monoxide (CO) gas is, without question, an unacceptable method of euthanasia in states where shelters can legally obtain and administer sodium pentobarbital. In those states where shelters currently cannot legally obtain and administer sodium pentobarbital or procure veterinary assistance to do so, The HSUS considers the use of CO a conditionally acceptable method of euthanasia for some animals, but only when delivered by a commercially manufactured and properly equipped and maintained chamber meeting the criteria outlined below. Only cool bottled, commercial-grade gas must be used; engine or chemically-generated gas is absolutely not acceptable due to impurities and heat, which make its use painful and inhumane.
It is always unacceptable to use CO for euthanasia of animals who are:
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