The summary says it all: When a puppy grows up it will teleport to the player. At least, when I have them sitting that is what happens. Then they will still be sitting as adults, teleported to the player. It's a bit annoying when I'm trying to build.

I suppose it could be considered a feature though if I wanted to fight monsters: So, I breed a ton of pups and they come to my aid when they are ready. Still, I would have to make them sit and then not sit. It's a bit of a weird mechanic. But for now, maybe I really should use it to my advantage.