"First I get swooshed with paint, then I get a bath! What's worse? A trip to the vet?!"-Martha
- Martha (in Nurse Martha, Martha Sings, Itchy Martha, Paws and Effect)
- Skits (in Nurse Martha)
- Bob (in Nurse Martha)
- Butterscotch (in Nurse Martha)
- Nelson (in Nurse Martha, Martha Takes the Cake)
- A moose
- Pops (in Martha's imagination)
- Unnamed Female Dog (in Nurse Martha)
- Teddy (in The Trouble with Teddy)
- They seem to be able to help many animals, as they once helped a moose.
- Martha doesn't work there full-time, but she sometimes gets summoned there if a dog's perspective is required.
- Martha likes working there, but she dislikes being a patient there, as does Skits, because both are scared of shots.