I had a German Shepard ( Saint) years ago that went into heat . the neighbors German Shepard mix came over and I know they tied once.  I mentioned it to my neighbor and she said her dog was neutered...time went by  and we all pretty much forgot about it.  One morning I got up and saint had delivered one pup.  What a shock!  My neighbor had rescued her dog from our Haven Humane so it was neutered before she took him home.  ( and she'd had him for a while).. I'm positive no other dogs had gotten into our yard...  

   He was our little mystery baby. 
