This is completely unacceptable. Feeding dogs human food is never a good thing and should be kept to an absolute minimum, as most foods cause many issues with dogs' digestive tracts. Only foods that are approved for animal consumption, (i.e. dog food and treats), should be given to dogs. There are very few human foods that can be given to dogs, and even then they must be A) properly cooked B) in moderation, and C) free of all seeds, stems, and other potential hazards.
The only time I would condone giving dogs people food is when trying to administer medicine, and even then discretion is greatly advised. Here is a link to a website that gives a good list of foods that should not be given to dogs and the reasons why, along with some foods that might be safe and how to properly prepare them for your pets: http://pets.webmd.com/dogs/ss/slideshow-...-never-eat
Now, as to the act itself, I find that rather disgusting on top of irresponsible. Dogs are not disposals and it is unfair to put their health at risk to use them as such, and it's offensive/repulsive to guests to watch your animals eat their leftovers. So, no. I absolutely would not let my dogs lick my plates clean. For health, modesty/etiquette, and sanitary reasons.
