I saw the "dog" running in the background of the final cut scene, but didn't connect the dots to the main game. Doh! Glad someone pointed it out. I'm also glad I played the DLC before making another run through the main game as I'll now have a greater appreciation/understanding of Pigsy's backstory.
I was surprised how long the DLC kept going; just when I thought it was about to end a new chapter loaded. Looking forward to a 2nd playthrough for trophy clean up.
Trophy cards in spoiler.
Please note: I don't accept blank friend requests.