Moose/Muffin is our favorite of this "If You Give a (?) a (?)" series of books, but the other two, Mouse/Cookie and Pig/Pancake, are just as good jumping-off points for clever stories of wandering attention, imagination, curiosity, and the sheer joy of play.
From an adult-critique standpoint, I think Laura Joffe Numeroff's story in this one was the most clever, scene to scene. All the shifts in focus make perfect sense, if you view the moose as personified the moment the kid tosses him the muffin, and never have too large a shift in the scope of the action. It's absurdly funny to have an animal the size of a moose at play like a child in the house.
My favorite illustration is of the moose and the kid -- probably a boy but not altogether clear, so she's a girl for my daughters -- painting the scenery for the puppet show. (Confused? Buy it and read it.) Felicia Bond is very gifted in conveying body language and movement in her characters, and her complex cartoon drawings are delightful all around.
Now this may seem like an obvious point, but a real moose is a very dangerous animal, so parents must instruct their very literal-minded small children that real wild animals are dangerous, and that stories like this are funny pretend stories -- can you say "metaphor" sweetie? You can imagine a friendly moose, but never go up to a real one. There are thousands of kids' stories with personified animals, so this is not a new thought to most adults, but sometimes it's hard for us to remember that *everything* is new to small children.
Our daughters enjoy all three, though I haven't seen Mouse/Cookie surface for a while, so I'll have to dig it out and read it to the 20-month-old. She loves Pig/Pancake and this one. Our older daughter (4.5) treasured all three beginning at her sister's age, and now uses them to really look at and read the words that she already knew by heart.
These are great books. Enjoy with them!