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Thank you for your question. My name is***** I have been a small animal veterinarian for 14 years and I'd like to help with your question.
It is always concerning when a dog chews on something he is not supposed to. There are definitely difference in grout formulations so the ideal thing to do is to try to see if there is a number on the bag that you can call and get advice from the company that is more familiar with their formulation.
However, I can tell you that most of the ingredients in grout mixture are not toxic, but can cause a few problems including intestinal irritation and some formations can be alkaline and cause ulceration of the mouth, throat and stomach. These alkaline formulations are the ones I would worry about, but there is no way to know what kind you have.
If the bag was truly empty and he only chewed on the bag then it is likely that he didn't get enough to cause a serious problem. I would take a look in his mouth and make sure there are no areas of ulceration or irritation. If there are or if he is drooling then I would definitely take him to a veterinarian ASAP.
If he is completely normal then I would offer him dilute chicken broth every few hours today to help dilute out any that got into the stomach. And put him on a bland diet to ease the stomach irritation... such as chicken and rice for 3 days.
And monitor him closely. Any vomiting or diarrhea (especially bloody), abdominal pain or lack of appetite can indicate that there is stomach irritation and it would be best to have a veterinarian see him and prescribe something to treat the stomach irritation.
The only other thing is... did he eat any of the bag? Or just chew on it. If he ate pieces of the bag then my recommendation is the same, but I think the risk of complication is higher and I might seek care sooner rather than waiting for any symptoms.
I hope that helps, but if you have more questions please let me know.