Subject was operating his pontoon boat toward his dock.  His dog jumped overboard and the man told his wife to turn the boat off and he then jumped overboard to help the dog.  The subject was swimming with the dog heading to shore.  The wife in the mean time was floating toward an opposite shore with the motor off.  She eventually hit a dock and ended up on shore.  She stated as she was nearing the shore the man yelled "help, help" and then went down.  He did not come back up after this.  The dog swam to shore on it's own.  The women tried to swim out to the man but could not locate him.  She then ran to a neighbor who took the pontoon boat out to locate the victim but he could not be found.  Victim was eventually found about 70 yards from shore in 5.7" of water.  Victim did have scratches on his chest indicating some kind of struggle wit the dog.
Tomahawk