He was dead, briefly however. You see, my poor little pooch Rex died and instead of loading a previous save I decided to simply resurrect him and move on. Fast forward to the end of the game, the Narrator tells me that Rex is dead even though hes standing right next to me aside Lanius's corpse. Is there some value that I can change that will assure the game that Rex is not dead and give me a proper ending to this playthrough?

Does it matter? It's only one slide :tops: Also why didn't you just load instead of cheating :verymad:

The main variable that checks his death is probably

set VNPCFollowers.bRexDead to 0

But in the gamne you have to use the form id of the quest so it would look like this

set B16D0.bRexDead to 0

There are a lot of other variables that should be reset when using resurrect as follows

set VNPCFollowers.RexHired to 1
set VNPCFollowers.bCritterInParty to 1
set VNPCFollowers.bPlayerHasFollower to 1
player.AddPerk SearchAndMark
RexRef.setfactionrank RexFaction 0
RexRef.setfactionrank DontTazeMeBroFaction 0
RexRef.setfactionrank AnimalFriendFaction 0
RexRef.setfactionrank CreatureHitDog 0
RexRef.setfactionrank KingsFaction 0
RexRef.setplayerteammate 1

You will have to prid to get rex's id for use in place of RexRef 118E71 is his base id. Or you can just click on him.