The Trouble with Tuck by Theodore Taylor

Helen adored her beautiful golden Labrador from the first moment he was placed in her arms, a squirming fat sausage of creamy yellow fur. As her best friend, Friar Tuck waited daily for Helen to come home from school and play. He guarded her through the long, scary hours of the dark night. Twice he even saved her life.

Now it's Helen's turn. No one can say exactly when Tuck began to go blind. Probably the light began to fail for him long before the alarming day when he raced after some cats and crashed through the screen door, apparently never seeing it. But from that day on, Tuck's trouble--and how to cope with it--becomes the focus of Helen's life. Together they fight the chain that holds him and threatens to break his spirit, until Helen comes up with a solution so new, so daring, there's no way it can fail.

A Crooked Kind of Perfect by Linda Urban

Ten-year-old Zoe Elias has perfect piano dreams. She can practically feel the keys under her flying fingers; she can hear the audience's applause. All she needs is a baby grand so she can start her lessons, and then she'll be well on her way to Carnegie Hall.           

But when Dad ventures to the music store and ends up with a wheezy organ instead of a piano, Zoe's dreams hit a sour note. Learning the organ versions of old TV theme songs just isn't the same as mastering Beethoven on the piano. And the organ isn't the only part of Zoe's life that's off-kilter, what with Mom constantly at work, Dad afraid to leave the house, and that odd boy, Wheeler Diggs, following her home from school every day.           

Yet when Zoe enters the annual Perform-O-Rama organ competition, she finds that life is full of surprises--and that perfection may be even better when it's just a little off center.