Can fallout 3 players help me?

I dont know what happened to Dog Meat, but sometimes my companions disapear too :( sadly. But the violin IS in vault 92! Here is a how to! a href="http://www.youtube.com/watch?v=E-vCtlnOONY" rel="nofollow"http://www.youtube.com/watch?v=E-vCtlnOO…/a btw, i havent played Fallout 3 in a while... New Vegas is the SHIZNIT