Why Is My Old Dog Panting at Night?

Nighttime panting in an older dog is a significant symptom that deserves investigation. Panting is a dog's response to physical or emotional distress, and when it occurs at night — when the dog should be resting — something is clearly bothering them.

Pain is the most common cause, and arthritis is the most common source of pain in senior dogs. Arthritis pain often worsens at night because: the dog has been less active (joints stiffen), the body's natural cortisol (anti-inflammatory) levels drop at night, and hard sleeping surfaces aggravate joint discomfort. The dog pants because they're uncomfortable but can't communicate it any other way.

Cognitive dysfunction syndrome (CDS) — canine dementia — affects up to 68% of dogs over 15 years old. Nighttime restlessness and panting are hallmark symptoms, along with disorientation, changed sleep-wake cycles (sleeping more during the day, restless at night), house soiling, and decreased interaction with family. The brain changes are similar to human Alzheimer's disease.

Heart disease causes panting because the heart can't pump blood efficiently, leading to reduced oxygenation. Congestive heart failure causes fluid in the lungs, making breathing harder — and the effort of breathing manifests as panting. Lying down can worsen this because gravity isn't helping drain fluid from the chest.

Cushing's disease (hyperadrenocorticism) — overproduction of cortisol — is common in older dogs and causes excessive panting, increased thirst and urination, a pot-bellied appearance, hair loss, and increased appetite. It's treatable but requires diagnosis.

Anxiety in senior dogs can increase as they lose sensory function (hearing, vision) — the dark, quiet nighttime environment becomes disorienting and scary for a dog who can't see or hear well.