When my dogs start eating grass it is always followed by vomiting and then not wanting to eat the food. Then it’s a vicious cycle of empty stomach and vomiting bile. I would say the switch but since it’s been months they are used to the food. Maybe in the long run its’ too rich for them? Maybe it’s time for some boiled chicken and rice to get their stomach healed and then slowly introduce the food again. I know I can take back any food at my pet supplies store and they give me full credit. Maybe you can buy a smaller bag and try to introduce the food again just in case it did go rancid. If the grass eating starts again maybe a new food search is warranted.
