Glossary
Euthanasia
A veterinarian's painless medical procedure to end an animal's life peacefully when suffering cannot be relieved.
Also called: putting a cat to sleep, humane euthanasia, pet euthanasia, end-of-life decision
Euthanasia means a gentle death brought about by a vet to spare an animal from suffering. It is one of the hardest decisions a cat owner faces. It is usually considered when an illness or injury cannot be treated, or when pain, breathlessness, or loss of the ability to eat and move cannot be controlled and the cat has more bad days than good ones.
The procedure is generally calm. Many vets start with a sedative, so the cat is relaxed and unaware, and then give an overdose of an anesthetic-type drug, usually by injection into a vein. Consciousness is lost within seconds and the heart stops shortly afterward. Owners can often stay, hold their cat and choose a quiet room, or arrange a visit at home. Muscle twitches, a deep breath or open eyes after death can happen and are not signs of pain.
There is no single right moment. Vets use quality-of-life checklists to help owners weigh appetite, pain, mobility, hygiene and enjoyment, and many suggest keeping a diary of good and bad days. hospice care may be an option when a cat still has comfort left. Ask your vet to tell you honestly what to expect, what the process involves, and what choices you have about aftercare. Support lines and pet-loss groups can help with grief.
Last reviewed November 7, 2026