One common reason for head shaking is itching. Dogs might be trying to free an itch in their ears or on their skin.
Ear infections can lead to irritation, prompting head shaking as a sign of hurting or irritation.
If water, foreign objects, or debris get trapped in a dog's ears, head shaking is a lifelike response to try to free them.
Certain breeds, similar those with floppy ears, are more prostrate to head shaking as they can trap moisture and air inside the ear.
A buildup of cerumen can cause irritation, making dogs shake their heads to try and clear it.
Allergies and irritants can steer to itching and head shaking as dogs try to facilitate their discomfort.
While occasional head trembling is normal, if it's persistent or accompanied by other symptoms, consult your vet for a exhaustive examination.