Dogs’ eyes typically stay open after euthanasia because the muscles that actively close the eyelids lose function once the brain stops sending signals. Closing the eyes is not a passive, relaxed state. It requires a specific muscle to contract. When that muscle relaxes at death, the eyelids naturally drift to a partially or fully open position. This is completely normal and does not mean your dog was aware or in pain.
Why Closing Eyes Requires Active Effort
The muscle responsible for closing a dog’s eyelids is called the orbicularis oculi. It’s a flat, elliptical muscle that surrounds the eye socket and works like a sphincter, squeezing the lids shut. This muscle handles both reflexive blinking and sustained eye closure. Without a signal from the brain telling it to contract, it simply doesn’t work.
Opening the eyes, on the other hand, involves a different set of muscles. The levator palpebrae superioris lifts the upper eyelid, and a smaller smooth muscle associated with it helps widen the eye opening, particularly during moments of alertness or stress. The lower eyelid is relatively fixed and has very little independent movement. So the “default” position of a dog’s eyelids, when no muscles are actively engaged, tends to be open or partially open rather than closed. Think of it like a hand: a relaxed hand falls slightly open, because making a fist requires muscle contraction. Eyelids work the same way.
What the Euthanasia Drug Does
The drug used in most veterinary euthanasia is a high dose of a barbiturate. It works by deeply suppressing the central nervous system in a specific sequence. First, it causes rapid unconsciousness, similar to surgical anesthesia. Within seconds to minutes, it stops brain activity entirely, followed by the heart and breathing. Once the brain is no longer functioning, it stops sending the electrical signals that keep muscles in a state of active tone or contraction.
The result is complete muscle relaxation throughout the body. The jaw may fall open slightly. The tongue may protrude. The bladder and bowels often release. And the orbicularis oculi, no longer receiving any signal to hold the eyelids shut, relaxes into its neutral position, leaving the eyes open. The pupils also typically dilate and become fixed, which can look unsettling but is simply another result of the nervous system shutting down.
Other Body Responses That Are Normal
Open eyes are just one of several physical changes that can catch pet owners off guard. Cornell University’s veterinary college notes that dogs sometimes take a few “agonal breaths” after losing consciousness. These are involuntary muscle contractions, not actual breathing, and the pet is not aware when they happen. After death, chemicals stored in nerve endings get released, which can cause occasional muscle twitching in the minutes that follow. A leg might jerk, or the body might shift slightly. These movements are purely mechanical and happen after the brain has already ceased all function.
Urination and defecation are also common immediately after death, as the muscles that normally hold the bladder and bowels closed fully relax. None of these responses indicate suffering or consciousness. They are the body’s systems winding down in the absence of any nervous system control.
Can the Eyes Be Closed Afterward?
You may have tried to close your dog’s eyelids after the procedure and found they didn’t stay shut. This is because there’s no muscle tension holding them in place. Unlike in movies, where a person gently slides a loved one’s eyelids closed, real eyelids without muscle tone tend to slide back open. Some veterinarians will gently close them or place a cloth over the face as a comfort for the owner, but the lids often reopen on their own. Once rigor mortis sets in, typically a few hours after death, the muscles stiffen and the eyelids may stay in whatever position they’re in at that point.
Why This Doesn’t Mean Your Dog Felt Pain
The open eyes can be one of the most distressing parts of witnessing euthanasia, because we associate open eyes with being awake. But the sequence of the drug’s effects matters here. Consciousness is lost first, well before the heart stops and well before the muscles fully relax. By the time the eyes are visibly open and fixed, the brain has already stopped processing any sensory information. Your dog was not looking at anything, not experiencing the room, and not aware of what was happening to their body.
The glazed, open-eyed appearance after euthanasia is one of the most universally reported experiences among pet owners, and it is one of the hardest to prepare for. Knowing that it’s a simple mechanical result of muscle relaxation, not a sign of awareness or distress, can help make sense of what you saw.