I would guess the same as you.. It sounds like someone was feeding him to many veggie treats. I know that stress can be a cause but I can’t see how stress would cause their droppings to turn bright green?
That is strange. I’m sure he will be fine though, your a good owner and mom
Sorry I can’t offer any expert opinion. But Im guessing someone spoiled him:P
Do you have any kind of green chew toy that is died green?