Is Cyanide used to kill dogs in Gas chambers?

Yes. This method is perceived to be more inexpensive by the public, but actually costs twice as much.

Relatively few shelters use this method as it takes a significant amount of time and supplies and is a public relations night mare - just picture a heading comparing a shelter euthanizing animals with some of the atrocities of the Holocaust. Most shelters use an injectable euthanasia method as it is reliable, easily administered and relatively inexpensive.