The X-Files, Season 6

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?

Mulder:
It's about territoriality. He's going to come back here tonight to make sure his dominance isn't challenged. He's going to put down the threat he failed to eliminate when he attacked Cahn. Karin Berquist confirmed it.

Scully:
Mulder, the only thing Karin Berquist is interested in is you. (he chuckles dismissively) You're kidding yourself if you think that she hasn't manipulated this entire situation for her own purposes.