You may be right.
I raise Jack Russell terriers, and I have a 9 year old female that weighs 6 lbs. She barks a split second before the power goes off or just before we see lightning. She also barks as soon as my husband turns off the garage lights, even though she is not where she could see them.
I also had a POA(Pony of America) who would hear the hot wire pulse and would perfectly use her top lip to pop off the wires without getting zapped!
One more– our German Shepherd would go racing to the electric fence and very carefully pull a weed or tall grass that was lying on the hot wire! It drove him crazy and he was so efficient that we never had to trim around the lower wires. My point is that these animals can hear the electricity and maybe smell it too. So, it only makes sense that a Bigfoot could also.