If you want to know the truth about this from your dog's point of view, then ask him! Here is a great video that shows the difference between a dog who says "no" to petting and dog that says "yes". A dog that consistently says "no" and is ignored and forced to tolerate unwanted attention may eventually get to the point of growling or biting. A dog that invites attention and enjoys it is much less likely to bite.
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Be sure to visit the blog by Eileen, the author of the video for more insights!