Objective: To retrospectively evaluate the incidence of seizures in dogs presenting with a history of seizures that were treated with acepromazine (ACE) during hospitalization. Design: Retrospective study. Setting: Privately owned emergency and referral hospital. Animals: Thirty‐one client‐owned dogs. Interventions: Administration of ACE. Measurements and main results: The medical records from dogs with an acute or chronic seizure history that received ACE were reviewed. Factors evaluated included presenting complaint, seizure history, ACE dosage, duration of observation, seizure activity, and other medications used. Thirty‐one dogs qualified for the study: 20 males and 11 females. Age range was 3 months to 14.9 years. Presenting complaint was seizure in 28/31 dogs. There was a prior history of seizures in 22/31 dogs, and 15/22 were currently on antiseizure medication. ACE was given 1–5 times per dog. Mean ACE dose was 0.029 mg/kg IV (range: 0.008–0.057 mg/kg; n=46), 0.036 mg/kg IM (range: 0.017–0.059 mg/kg; n=14), 0.53 mg/kg PO (n=2). Twenty‐seven dogs did not seizure after administration of ACE within the observation period (mean: 16.4 hours, range: 0.25–66 hours). Twenty‐five dogs received antiseizure medication before ACE. Eight seizure episodes occurred in 4 dogs (all of whom presented for seizures) within 0.3–10 hours after ACE administration. Conclusions: There was no observed correlation between ACE administration in dogs with a seizure history and the recurrence of seizure activity during hospitalization. The time from ACE administration to seizure activity was greater than expected for measurable effects to be seen in 1 dog (10 hour). Further studies with a larger group and alternative ACE doses are needed to more thoroughly evaluate the safety of short‐term ACE use in dogs with a seizure history.

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