| | | | Part I |
| | Edgar | Sawtelle | Protagonist. |
| | Mr. | Schultz | The man from which John bought their land. |
| | Mary | Sawtelle | Edgar's grandmother. |
| | John | Sawtelle | Edgar's grandfather. |
| | Violet | | The Sawtelle's dog. Aka: Vi. |
| | Captain | | The massive dog that John likes. Aka: Cappy. |
| | Billy | | Captain's owner. |
| | Gus | | The puppy that John bought from Billy. Captain's puppy. |
| | Gregor | Mendel | A Czechoslovakian monk. |
| | Mr. | Adamski | Mr. Schultz's lawyer. |
| | Gar | Sawtelle | Edgar's father. |
| | Trudy | Sawtelle | Edgar's mother. |
| | Page | Papineau | The veterinarian. |
| | Almondine | | Edgar's dog. |
| | Ida | Paine | The proprietor of Popcorn Corners. |
| | Louisa | Wilkes | A woman who visits his nephew and niece. |
| | John | Wilkes | Louisa's nephew. |
| | Eleanor | Wilkes | John Wilkes's wife. |
| | Benny | | Gar's dog. |
| | Hector | | The dog that Edgar named. |
| | Claude | Sawtelle | Gar's brother. Edgar's uncle. |
| | George | Geary | A man who works at the post office. |
| | Iris | | One of Edgar's puppies. |
| | Alice | | Edgar's old orange Allis-Chalmers C tractor. |
| | Alexandra | Honeywell | An actress. |
| | Auld | Lang Syne | A singer. |
| | Glen | Papineau | Page Papineau's son. A sheriff. |
| | Mr. | Brentson | Glen's friend. |
| | Forte | | Gar's dog. |
| | | | Part II |
| | Finch | | Edgar's puppy. |
| | Baboo | | Edgar's puppy. |
| | Annie | | Glen's assistant. |
| | Jim | Frost | Gar's doctor. |
| | Tinder | | One of Edgar's dogs. |
| | Gordy | Howe | Owner of a truckload. |
| | Art | Granger | Gar's friend. |
| | Yonder | | Art's dog. |
| | Mr. | McCullough | Gar's neighbor. |
| | Mrs. | McCullough | Mr. McCullough's wife. |
| | Haze | | The third dog that the Sawtelle family owned. |
| | Mrs. | Santone | Gar's friend. |
| | Deary | | Mrs. Santone's dog. |
| | Alvin | Brooks | One of the original breeders at the Fortunate Fields project. |
| | Dorothy | Eustice | A dog breeder. Founder of Fortunate Fields. |
| | Amos | | Buddy's siblings. |
| | Conrad | McCalister | Amos's owner. |
| | Buddy | | The most famous dog of Fortunate Fields. |
| | Opal | | One of Edgar's dogs. |
| | Umbra | | One of Edgar's dogs. |
| | Belva | | One of Edgar's dogs. |
| | Essay | | One of Edgar's dogs. |
| | Pout | | One of Edgar's dogs. |
| | Epi | | One of Edgar's dogs. |
| | | | Part III |
| | Hachiko | | The missing dog. |
| | Charles | Aldwin | John's friend. |
| | Charles | Aldwin Jr. | Charles's son. |
| | Professor | Ueno | Hachiko's master. |
| | Ouji | | Charles's dog. |
| | Donald | Rogers | Gar's schoolmate. |
| | Marjory | Schneider | Gar's schoolmate. |
| | Olive | | One of Gar's dogs. |
| | Gleam | | A 4-year-old brindle. |
| | Alex | Franklin | A boy that Edgar hypnotized. |
| | Singer | | A dog that Trudy trained. |
| | Indigo | | A dog that Trudy trained. |
| | Mr. | Benson | A man who bought one of Sawtelle's dogs. |
| | | | Part IV |
| | Henry | Lamb | A man that Edgar met. |
| | Doctor | Howe | A doctor from Ashland. |
| | Adam | | A bartender. |
| | Walt | Graves | A man who delivered RFD mail. |
| | | | Part V |
| | Jasper | Dillon | A truck owner. |
