Like humans, dogs yawn when tired or bored to increase alertness.
Drowsiness
Yawning helps dogs relieve anxiety or nervousness by taking deep breaths.
Stress Relief
Dogs empathetically yawn when they see or hear owners or other dogs yawning.
Mimicry
Panting & yawning helps cool dogs down on hot days.
Overheating
Some dogs yawn when anticipating mealtimes.
Hunger Pangs
Dental problems, allergies or respiratory disease can prompt yawning.
Medical Issues
Neurological conditions like seizures or dementia can cause yawning.
Brain Changes