"Anything a dog wouldn’t eat doesn’t have to be removed or destroyed. I don’t know why you’d want to keep it in your kitchen if a dog wouldn’t eat it, but I won’t judge."

From my college days, this is primarily a problem in Jewish fraternity houses. I specifically recall having old pizza in our house that was too foul and hard for even a dog to eat. But, come any given early morning and you could count on someone popping the pizza in the microwave for an early snack. I think the dog rule only works if the dog wouldn't eat it in any condition. Thus, we adopted the rule that such pizza could not be eaten during Pesach even though a dog would not have eaten it without microwaving it first.

While we're on the issue of Pesach in Jewish fraternities, I caution all Ashkenazim that hemp seed may be considered kitnyos, so canabis should be sold before Pesach.