The material covering the power cord (plastic/vinyl/rubber?) is not digestible, but if he did not eat a large piece, if it were not a very thick cord, and/or if he chewed it up into smaller pieces before swallowing, it should most likely pass through his system naturally. Watch his stool for pieces of the cord--you'll need to pick through each b.m. to find the pieces.
However, you'll monitor him for symptoms of GI upset, like vomiting, decreased or no appetite, constipation and/or diarrhea, and any other unusual symptoms or signs of illness; if you observe him acting unusual, it would be advisable to have him evaluated in person by the vet, as soon as possible.
I hope all will be well with your furry boy!
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Edited by Cher on 4/24/2010 at 2:18 AM EST