| Matt Walsh | ... | Alan Waxman (1 episode) |
| Jessica Makinson | ... | Trudy (1 episode) |
| Bobbie Prewitt | ... | Lily (1 episode) |
| Esther Marie | ... | Hot Girl (1 episode) |
| Leigh Bush | ... | Hot Girl (1 episode) |
| Malcolm Devine | ... | Animal Handler (1 episode) |
| Marisa Quinn | ... | Animal Handler (1 episode) |
| Robin Larsen | ... | Ms. Fry (1 episode) |
| Robin Larsen | ... | Mr. Fry (1 episode) |
| Dominic Daniel | ... | Vet Tech (1 episode) |
| Peter Reinert | ... | Hipster (1 episode) |
| Lano Medina | ... | Vet Tech (1 episode) |
| Jeremiah Hu | ... | Waiter (1 episode) |
| Paul Rust | ... | Jerry (1 episode) |
| Jacob Hopkins | ... | Connor (1 episode) |
| Phillip Wilburn | ... | Connor's Dad (1 episode) |
| Nick Jaine | ... | Rod (1 episode) |
| Yee Yee Lee | ... | Judy (1 episode) |
| Kenny Ridwan | ... | Young Yamamoto (1 episode) |
| Kenji Nakamura | ... | Yamamoto's Father (1 episode) |
| Kevin Heffernan | ... | Max Ricketts (1 episode) |
| Brandon Ford Green | ... | Reporter (1 episode) |
| Laura Spencer | ... | Sarah (1 episode) |
| Drew Tarver | ... | Todd (1 episode) |
| Jessica Leigh Gonzales | ... | Vet Tech (1 episode) |
| Chris Fogleman | ... | Vet Candidate (1 episode) |
| Marianne Chambers | ... | Tiffany (1 episode) |
| Jodie Mann | ... | Nurse (1 episode) |
| Pat Kiernan | ... | Himself (1 episode) |
| Danielle Riffenburgh | ... | Giggling Nurse (1 episode) |
| Desiree Perry | ... | Giggling Nurse (1 episode) |
| Annie Potts | ... | Virginia Coleman (1 episode) |
| Alan Brooks | ... | Mr. Wesley (1 episode) |
| Circus-Szalewski | ... | Cab Driver (1 episode) |
| Irene Roseen | ... | Olivia (1 episode) |
| Wyatt Oleff | ... | Young George (1 episode) |
| Jack Axelrod | ... | Old Man (1 episode) |
| James Defalco | ... | Hospital Worker (1 episode) |
| Isabella Niems | ... | Little Girl (1 episode) |
| Chris Williams | ... | Hubert Queel (1 episode) |
