Stockholm syndrome? And yeah, I've seen them together... maybe there's simply a similar dog around, or someone like him. I thought it was a funny scene... I wasn't expecting it since I didn't think Sam would've gotten there that fast.

For some reason I thought it would be some evil serial killer dog. I'm not so sure Sam is the bad guy as I previously though of him as. But I find it quite curious that the killer killed the cat, and we all know how much dogs like cats.