Buddy: The First Seeing Eye Dog, by Eva Moore, illustrated by Don Bolognese, Scholastic Book 1996.
This is a delightful true-life story for a second-grader. My second-grader was impressed with the friendships in this book: The friendship between Kiss and Gala, and the friendship between Kiss (now Buddy) and Morris.
The illustrations are tender and action-packed, and add so much to the text.
The only thing that didn't quite make sense was the title. Buddy was the first seeing eye dog in the US, but she wasn't the first seeing eye dog.