his hips cracking. ??? is that bad? It only happens when he moves certain ways so its not a constant cracking...
I would personally have them checked, if nothing else, to ease your fears.
"Cracking" is not a "normal" joint occurance, though it can be as simple as a loose ligament that could be "snapping" during movement.
If it is a concern enough to you to ask about here on this forum, it is definitely worth getting checked out by your veterinarian.
~Julie, Rogue, Monty, and Eddy~
"The reason a dog has so many friends is that he wags his tail instead of his tongue." -Anon