>>213791816Brian is a medium sized dog and Stewie is a baby, Brian would weigh approximately 30kgs and Stewie around 10kgs.
A 750ml bottle of 12% champagne has around 71g of pure ethanol, with the prior body weights we can approximately calculate the BAC to be 1.97‰ for Brian and 4.73‰ for Stewie if they went 50/50 on the bottle, or 2.63‰ for Brian and 3.16‰ for Stewie if Brian drank 2/3rds and Stewie the remaining 1/3rd.
Anyways, we are talking about a very high BAC in either case here.
The lower your body mass is, the more fucked up you will get.