After the mission where I had to find and kill Kellogg it would appear after dogmeat had found Kellogg for the quest and when I had rekted him with a fat man and got back up to the surface and tryed to find dogmeat in sanctuary hills he was there. Then I came back to sanctuary later and I couldn't find him anywhere doghouse? Nope. All my other settlements? Nope. Please somebody tell me a way I could get him back, I don't have anyone else to use as companion when I'm doing brotherhood things that I really think nick might get killed in.