Final answer:
In chapter 8, the pigs alter the commandment about alcohol consumption by changing it to 'No animal shall drink alcohol to excess.'
Step-by-step explanation:
In the book, the pigs alter the commandment about alcohol consumption after drinking Jones' whiskey in chapter 8. They originally changed the commandment that said, 'No animal shall drink alcohol,' to 'No animal shall drink alcohol to excess.' This alteration allowed the pigs to justify their own excessive consumption of alcohol while still appearing to follow the commandment.