Bumping this for you. This is my personal opinion. I would most certainly have it checked by your vet and possibly be sent on to a specialist. I have been told that it is better to take care of issues before they get out of hand. There are also meds that can be given that help temporarily---pain and glucosemine. This brand has been recommended:
Cosequin Regular Strength (90 capsules)
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Joanne
Eli
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Rosie(R.I.P. 1996-July 29, 2013)
Cocoa(R.I.P 1998-April 26, 2012):