| Name | Character | Episodes |
|---|---|---|
| Joe Pantoliano | Sparky (voice) | 26 |
| Hank Azaria | Killer (voice) | 26 |
| Brian George | Mr. Huggs (voice) | 26 |
| Nicholle Tom | Ryce Newton (voice) | 26 |
| Joel Murray | Beethoven (voice) | 26 |
| Bill Fagerbakke | Caesar (voice) | 26 |
| Tress MacNeille | Ginger (voice) | 26 |
| Kath Soucie | Alice Newton (voice) | 26 |
| Maurice LaMarche | Police Officer (voice) | 26 |
| Dean Jones | George Newton (voice) | 26 |
| Christine Cavanaugh | Rosebud (voice) | 26 |
| Tony Jay | Watson (voice) | 26 |
| Scott Menville | Puff-Puff (voice) | 26 |
| David Doyle | Blind Shep (voice) | 26 |
| Gregg Berger | Dirt Salesman (voice) | 26 |
| Francesca Marie Smith | Emily Newton (voice) | 26 |
| Justin Shenkarow | Roger (voice) | 26 |
| J.D. Daniels | Ted Newton (voice) | 26 |