We reviewed the indications for age and breeds of dogs who received transvenous endocardial artificial pacemaker (AP) implantation (n 5 105) and complications and survival thereafter at a single institution over a 6-year period. A third-degree atrioventricular (AV) block (59%) and sick sinus syndrome (SSS; 27%) were the most common indications, along with a highgrade second-degree AV block (9%) and atrial standstill (5%). The most common breeds identified were Labrador Retriever (n 5 16; 11 with a third-degree AV block), American Cocker Spaniel (n 5 14; 10 with SSS), and Miniature Schnauzer (n 5 13; all with SSS). Common presenting complaints were syncope (n 5 66) and exercise intolerance or lethargy (n 5 25). Half of the dogs (n 5 52) had a history of acute onset of clinical signs (,2 weeks). Mean survival time for the 60 dogs who died during the study period was 2.2 years (range, 0.1-5.8 years). Major complications occurred in 13% of dogs and included lead displacement (n 5 7), sensing problems that led to syncope (n 5 3), infection at the pacemaker site (n 5 1), bleeding (n 5 1), and ventricular fibrillation during implantation (n 5 1; successfully defibrillated). Minor complications occurred in 11 dogs (11%). The success rate of transvenous AP implantation was comparatively high (all dogs survived the first 48 hours), and the complication rate was comparatively low when compared with a previous multicenter study, most likely because of how commonly the procedure was performed and supervisory experience.