These are the most common things that cause a slipped disc. Often times, a disc will slip and immediately pop back into place. This can make the proper difficult to diagnose, as X-rays will appear normal. This can be very painful for the dog, but it will heal within a few days. Your vet may prescribe pain killers, as well as something to make the dog drowsy so it will rest, allowing the injury to heal.
Rest is usually the best thing for a disc which has just slipped out and in.
More serious back problems can require surgery which can correct many problems. The most important part of obtaining a good show coat is nutrition, exercise, and proper grooming. Exercise Elderly people buy pekes believing that they need little exercise, but this is wrong. While they do make wonderful apartment dogs, pekes also love to run and romp in large open yards or fields. The important thing is that they have space to run, whether it's a fenced yard or just a long hallway.