For relief.. Iceman as mentioned above. It will freeze up the muscle(stop spasms) and allow it to heal(its kinda like reporral gel but more effective and doesn't do the heating of muscle like deep heat and its cheaperalthough its apparently for horses.. lol).
I love the "consult vet if you have issues" statement.
Blu, get X-rays and see a chiropractor. One will tell you of serious issues, the other will resolve any non-surgical issues and give you exercises.