Which diagnosis is likely for an English bulldog that exhibits intermittent horizontal head tremors that can be distracted by treats?

The diagnosis of idiopathic head tremors is consistent with the symptoms described, specifically the intermittent horizontal head tremors in the English bulldog that can be distracted by treats. Idiopathic head tremors are characterized by involuntary, rhythmic movements of the head that are often not associated with any underlying neurological disease and can occur in certain breeds, including English bulldogs. The fact that these tremors can be interrupted or distracted by the presence of treats suggests that they are not indicative of a seizure disorder, where the animal would not be responsive during the episode.

Additionally, idiopathic head tremors are usually benign and the affected dog typically remains alert and aware, which aligns with the behavior of being able to focus on treats. This differentiates idiopathic head tremors from other conditions like cerebellar ataxia, vestibular disease, or seizure disorders, which would present with more serious and persistent neurological signs. Each of these conditions tends to exhibit more significant impairment or loss of consciousness, neither of which is observed in cases of idiopathic head tremors. Thus, the characteristics and behavior associated with the tremors make idiopathic head tremors the most likely diagnosis.