Dog Shakes Head When Barking. An ear infection is the most frequent issue that causes excessive head. Ear hematomas develop due to trauma to the vessels within the ear, leading to a collection of blood in the pinna.

Ear hematomas develop due to trauma to the vessels within the ear, leading to a collection of blood in the pinna. For example one of my dogs has a lot of them. A common cause for your dog to shake its head while barking is ear trauma.