Report Nails Cracking in Health and Genetics Posted December 15, 2011 Not about my BC, but thought I would gather some advice. My Blue Heeler (3 yr old) gets cracked nails on his front paws frequently. I keep his nails trimmed as well as he runs so much that most of the time he wears his own nails down. Perhaps this is the problem? But... He runs on grass and dirt not concrete or asphalt... Could it be a sign of some vitamin deficiency? The nail also cracks up the side, usually just past where the quick area starts, and flakes off. Any suggestions? Thanks!