Grasp all,Lose all

A dog once stole a piece of meat from a butcher's shop.The dog was very happy in the hope of having a nice Neal of it.So,he tried to go to a safer place by crossing a bridge over a canal.He looked down in the canal and saw another dog carrying a piece of meat in its mouth.The dog stopped on the bridge and looked down very carefully .He became greedy to get the other piece of meat.In fact,he saw his own image.Instantly the piece of meat fell into the water.The dog jumped following the piece of meat that was dropping.Alas!he failed to get it.He somehow swam to the other bank of the canal and remained unfed.