Your Pug Seems to have weak rear legs, this really is a problem with their spinal cord. Rear wobbly legs, weak legs begins in middle-aged dogs thought to be typically at 6-9 years old. Interesting is that Pugs enrolled in Dr. Jon S. Patterson's Pug Myelopathy study at Michigan State University, the average age of onset has been 9 years. Read Dr. Patterson's Research Study Update to learn what is really wrong with your pug.