The aim of the present paper is to identify the slow wave (SW) of the bioelectric activity of the small bowel recorded at the abdominal surfac (electroenterogram) to detect which internal record is detected at the abdominal surface. Prony’s method was used in this study. Internal and external recordings were acquired simultaneously from fi ve beagle dogs (in 10 recording sessions). Akaike’s Information Criterion (AIC) was used to obtain the optimal order of Prony’s method, and was calculated for each minute of abdominal and internal myoelectric signal. The optimal order was of p = 29 and q = 1, with a frequency resolution of ∆f = 0.06 Hz. The maximum frequency peak on the signal spectrum was found around 0.3 Hz. Prony’s method analysis showed that the slow wave can be detected on the abdominal recordings of the intestinal myoelectrical activity without breathing interference and statistically can determine the internal record that corresponds to the record at the abdominal surface.