yes, once you obtain dogmeat he will stay with you till the end of the game.. but he can die.... so u need to watch his health and keep him healed.. he will also go on ammo and item hunts for you... or you can tell him to go wait in the vault.... he is very handy as he will even attack enemies.
QX9650 QuadCore 3.00GHz, QUAD SLI with DUAL eGeForce 9800 GX2's, 4GB DDR3 1333, DUAL 150GB 10000 RPM Raptor's RAID 0, Killer Net Card 400MHz, Vista Ultimate 64
Dogmeat 1 Never died for me. Even after being hit by a minigun. Suprisingly, he got the finishing kill for me against the last boss (one in catherdral, can't remember his name) And he lasted so long cause I kept him healed alot.