Ian McEwan's Black Dogs is a lot more sinister, suspenseful, and scary. It is the story about how a young woman's run-in with these huge animals (she thought they were donkeys initially) changed her life and her outlook on the world. The story is told kind of back and forth, so you don't actually get to find out what actually happened when she encountered the dogs until the very end of the book. There is a lot in here about Communism, the fall of the Berlin Wall, Nazi Germany, and other important events affecting Europe in the 20th century as well.
I really enjoy Ian McEwan's writing. Good stories that also really make me think.