It's probably a 3- to 3 & 1/2-star book, but gets the extra boost because I can't say no to this dog. I want a dog like Enzo. 
 The very first paragraph prepares you for what is going to happen, but it doesn't make the rest of the story any less interesting, or any less sad, for that matter. Bring tissues, and make sure you're driving on a straight-stretch of road if you're listening to the audiobook.