The dog may have died of starvation after Hackman and his wife died and were unable to feed it.
That report from TMZ is indeed odd. She had collapsed in the bathroom, pills were spilled.
He was in the bedroom and looked like he had collapsed because of the way his sunglasses had been dropped.
No sign of any gas.
She had been dead for some time.
Dog in a closet. Other dogs alive both inside and outside.
So not found for over several weeks? Dehydration I can see in only a few days, maybe a week. Think of the rule of 3’s:
1. 3 minutes without air.
2. 3 hours from exposure.
3. 3 days without water.
4. 3 weeks without food.