Special Agent Fox Mulder
Special Agent Dana Scully
Dr. James Riley
Two of the episode's characters, Dr. Detweiler and Karin Berquist, take their names from Over the Rhine, a Cincinnati-based band featuring husband and wife duo Linford Detweiler and Karin Bergquist. Over the Rhine released an album entitled "Good Dog Bad Dog" in 1996, where some of the episode's canine focus likely came from as well.
Some transcripts describe the language spoken by the two boat hands at the start of the episode as Cantonese (it is noted that the ship has a 'Chinese' name) but they count down before open the crate in Japanese? There are certain similarities between the Japanese, Cantonese and Mandarin languages and dialects but they seemed to switch from one whole language to another.
This episode sees the return of the "I Want To Believe" poster. Karin Berquist had one and it arrives at the office at the end of the episode and Mulder puts it up.
Officer Cahn: Calls himself a crypto-zoologist.
Officer Cahn: Yeah they deal with animals thought to be extinct. Animals...
Mulder: Animals that aren't supposed to exist, like Sasquatch and the Ogopogo and the Abominable Snowman and--
Scully: Don't mind him. He'll go on forever.
Scully: Mulder. She's a friend of yours?
Mulder: We met online.
Mulder: Two professionals exchanging information.
Scully: What happened to the dog?
Mulder: Dog gone. Dog gone. (realizes play on words) Doggone.
Scully: Yeah, I got it.
Scully: Aren't you going home?
Mulder: I am home. I'm just feathering the nest. (he is pinning pictures of dead men to the wall.)
Mulder: I think we're speaking in too common terms about an animal we're calling a dog but which displays none of the behavior of man's best friend.
Scully: You mean covering up crime scenes?
Mulder: (smiles) You get a biscuit, Scully.
Scully: A dog? A dog dog?
Mulder: Yo quiero Taco Bell
Dietwieller: You kill that dog and I'll kill you.
Mulder: It's Detweiler... but it's not Detweiler. It's something that he becomes.
Mulder: Through some blood curse, this man undergoes some kind of nocturnal transformation. He becomes the same shape-shifting trickster as that mythical dog.
Scully: So, what is he going to do? Walk in here, skitter across the linoleum and pee in the corners?
Scully: She's enamored of you, Mulder. Don't underestimate a woman. They can be tricksters, too.
The deadbolt on the vet's office door is missing from the shot when the policeman walks up to the door, but, it is back in the closeup when he opens the door.
T'ien Kou, the name of the Chinese freighter, translates to 'heavenly dog', a Chinese term for 'shooting star'.
Melinda Culea, who plays the role of Karin Berquist, is the wife of the episode's director, Peter Markle.
This episode has an alternate ending. In that, the episode doesn't stop with Mulder looking at the poster, but with Cahn turning around in his bed, to reveal that he was infected by the Dhole. This can be seen on the DVD box.
Parts of this episode take place in Bellflower, California; which is Chris Carter's home town.
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