That’s Denis. He’s Armand’s pet. We don’t know much about him.

3 things about this bite:

1. After watching the gruesome performance at the Theatre, Louis and Claudia are both pretty hungry. Seems like a courtesy offering to a vampire, like you might offer someone water or soda or whatever when they’re a guest in your house. In the book, Claudia gets a bite of Denis, too.

2. Seems like a trust-building exercise. All the vampires in the Theatre are watching him, and we’ve seen how easy it is to poison a vampire. Louis accepting this offering is a show of good faith, trusting them that they’re not poisoning him right then.

3. Killing/drinking blood is a very sensual experience for vampires, Louis describes sex as “the pale shadow of killing.” Makes sense then, that Louis does not like to be watched doing it. Also, he’s usually unable to stop himself from killing his victims. Armand’s mind gift is very strong, and he’s enjoying this whole moment on a deeper level.

We know that Denis is fiercely devoted to Armand, he even drives the getaway carriage for him and Louis after Louis serves his revenge at the Theatre des Vampires, en flambé, of course.