Euthanasia dream meaning is explained below using 2 different sources. Each interpretation is shown with its source.

Interpretation 1 — myjellybean

To dream about euthanasia (whether it was you or someone else doing the killing, or being euthanised) generally represents the killing off of old parts of yourself and old habits. You may be saying goodbye (or preparing to say goodbye) to a part of you, or a part of your life, that you wish would leave you alone and stop creating strong feelings. Even if it is disturbing, this dream generally foretells inner changes, transformation, self-discovery and positive developments in the dreamer’s life.
Source: My Dream Interpretation Author: myjellybean

Interpretation 2 — Joan Seaman - Tom Philbin

Kindness, mercy.
Source: New American Dream Dictionary Author: Joan Seaman - Tom Philbin