Do you mean the large end that goes into the wall? Or the smaller end that plugs into the laptop? The smaller end could probably pass through a full size yorkie, but but I don't know about the plug-in-to-the-wall end -- seems too large to me! The vet says if he doesn't pass it by NEXT Friday bring him in? That seems much to long. I think I would be inclined to request an xray at 2 day mark.
EDIT: I did go check just to make sure and found this reference:
"In all, the entire process, from the time a dog bites into his food to the time waste is produced, can take anywhere from around 10 hours to a couple of days. " This is from this site:
http://www.ehow.com/how-does_5162842...gest-food.html
Obviously something like plastic and wire may stick around in the small intestine longer than usual but I think 2 days would still be my cutoff for wanting the xray done.