Which definition best describes euthanasia according to AVMA guidelines?

The definition that best describes euthanasia, according to AVMA guidelines, focuses on the process of inducing rapid unconsciousness in a way that minimizes distress for the animal. This approach emphasizes the humane aspects of euthanasia, ensuring that the animal experiences as little suffering as possible during the transition to a state of unconsciousness before passing away.

In the context of veterinary medicine and animal welfare, euthanasia is performed to prevent undue suffering, particularly in cases of terminal illness or severe injury. The goal is to provide a peaceful end to life, which aligns closely with the principle outlined in the correct definition.

Other definitions may mention related aspects of animal care but do not encapsulate the core ethical principle of euthanasia as effectively. For instance, options that refer to preserving physiological functions or reducing emotional distress may not accurately represent the procedure's intent or methods. Similarly, preparing animals for invasive procedures, while important in a clinical context, does not pertain to the definition of euthanasia itself.