Can dogs really remember everything in their lives?

arguably this could be a veterinary problem for Canines in the K-9 corps of the Army, Marines, and some police units- the causes would be the same-massive trauma or battle shock! I have never heard of this but it is quite logical Shakespeare said: Cry Havoc! and let slip the Dogs of War, he did not tie in Mnemone the Greek Memory goddess, but well, it can happen.