While conducting a routine physical on a 4 year old male intact bulldog, an irregular heart rhythm with a slow rate that is markedly slower on expiration is audible during auscultation. What should be done next? Value Normal T=102.1 F (38.9 C) 99.5-102.5 F, 37.2-39.2 C HR=60 bpm 60-120 RR=24 brpm 15-34

A - Refer to for cardiology consult
B - ECG
C - Echocardiogram
D - Chest radiograph, CBC, blood chemistry panel
E - Nothing