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Used of Marines for someone who is very experienced at their job and/or who has been enlisted for a long time.

also see salty
"Grandpa was with those salt dogs that took Iwo Jima."

"The guys who took Fallujah were some salt dogs!"
by bivouac June 01, 2005
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An overly salty person who expresses his saltiness through reckless and illogical acts.

Literally an dog/animal.
Person 1: Hey man! Look at you over there, sweating your ass off! (After losing)
Person 2: (Laughs) Salt Dog!
by June 14, 2018
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