Xirbtt | Fallout Ch.4-5 DogMeat Dies @Xirbtt | Uploaded February 2010 | Updated October 2024, 10 hours ago.
While traveling a group of mutants ambush Dogmeat and I.
In the frenzy of battle Dogmeat fell.

You'll always be remembered Dogmeat, as the best companion in the Fallout Universe.

Now for some technical things: Dogmeat is technically supposed to die in the military base. So for canon reasons I'm putting this info up.
Also as for Tycho and Ian's canon deaths I do believe they were to be vaporized by mutants.

R.I.P. Dogmeat
Video 2-6 to Video 4-5