If you liked reading "PAX" by Sara Pennypacker, you might enjoy these books too:
"Kindred Souls" by Patricia MacLachlan
Ten-year-old Jake has always been close to his grandfather Billy—so close that Jake's mother calls them kindred souls. Each morning, Jake and Billy take a walk around the family farm. Billy often tells Jake stories of living in a sod house on the prairie.
When Billy goes into the hospital, Jake decides the best gift he can give his beloved grandfather is a sod house. Billy moves to the sod house when he leaves the hospital and spends his last days living there.
"Duke" by Kirby Larson
With World War II raging and his father fighting overseas in Europe, eleven-year-old Hobie Hanson is determined to do his part to help his family and his country, even if it means giving up his beloved German shepherd, Duke. Hoping to help end the war and bring his dad home faster, Hobie decides to donate Duke to Dogs for Defense, an organization that urges Americans to "loan" their pets to the military to act as sentries, mine sniffers, and patrol dogs. Hobie immediately regrets his decision and tries everything he can to get Duke back, even jeopardizing his friendship with the new boy at school. But when his father is taken prisoner by the Germans, Hobie realizes he must let Duke go and reach deep within himself to be brave. Will Hobie ever see Duke, or his father, again?
With powerful storytelling and gripping emotion, critically acclaimed author Kirby Larson explores the many ways bravery and love help us to weather the most difficult times.
"The Trouble With Chickens" by Doreen Cronin
J. J. Tully, a former search-and-rescue dog, is supposed to be resting and relaxing after a noble career. But he is hardly settled into his new home before a mama chick named Mildred wants him to find two of her brood that have gone missing. Tully’s willing to take on the case for a hamburger, but a ransom note soon complicates things, and a house dog, Vince the Funnel (for the contraption wrapped around his head), is out to make sure that he is not the canine going to the vet to get tubes in his ears. The plot is a bit convoluted, and when the narrator changes in the middle of the book, even experienced readers might be confused. But the noirlike detective Tully and the funny chickens running around, well, like chickens make appealing characters, especially as drawn by Cornell, who knows how to get TV cartoon–style humor out of the action.
"Lassie Come Home" by Eric Knight
Lassie is Joe's prize collie and constant companion. But when Joe's father loses his job, Lassie must be sold. Three times she escapes from her new owner, and three times she returns home to Joe, until finally she is taken to the remotest part of Scotland--too far a journey for any dog to make alone.
But Lassie is not just any dog.
(This book was first published in 1940, and it has become one of the best-loved dog stories in the world.)
"Masterpiece" by Elise Broach
Marvin lives with his family under the kitchen sink in the Pompadays' apartment. He is very much a beetle. James Pompaday lives with his family in New York City. He is very much an eleven-year-old boy.After James gets a pen-and-ink set for his birthday, Marvin surprises him by creating an elaborate miniature drawing. James gets all the credit for the picture and before these unlikely friends know it they are caught up in a staged art heist at the Metropolitan Museum of Art that could help recover a famous drawing by Albrecht Dürer. But James can't go through with the plan without Marvin's help. And that's where things get really complicated (and interesting!). This fast-paced mystery will have young readers on the edge of their seats as they root for boy and beetle.
(This book won the 2009 Bank Street Best Children's Book of the Year.)
"Old Yeller" by Fred Gipson
At first, Travis couldn't stand the sight of Old Yeller
The stray dog was ugly, and a thieving rascal, too. But he sure was clever, and a smart dog could be a big help on the wild Texas frontier, especially with Papa away on a long cattle drive up to Abilene.
Strong and courageous, Old Yeller proved that he could protect Travis's family from any sort of danger. But can Travis do the same for Old Yeller
"Buddy" by M. H.Herlong
Tyrone "Li'l T" Roberts meets Buddy when his family's car accidentally hits the stray dog on their way to church. Buddy turns out to be the dog Li'l T's always wished for--until Hurricane Katrina comes to New Orleans and he must leave Buddy behind. After the storm, Li'l T and his father return home to find a community struggling to rebuild their lives--and Buddy gone. But Li'l T refuses to give up his quest to find his best friend.