Targa's pet should have his own respawn time because if the pet dies and Targa is still alive the pet would never respawn unless Targa dies and then respawn.
I just found something pretty cool. If Gustav and the gambler come to your outpost to gamble. Gamble with them and keep winning, you will get a notice saying that Gustav doesn't have enough food to feed his cat and he will you the cat. The cat give .5 to science, building, scavenging, and leadership.
OMG I actually finish the freaking game. 590 deaths. Tip: Your blood and remains help you find the invisible walls, also the invisible wall for level 33-50 is the same.