My bully has been vomitting for the past few days and I thought it was the stomach flu. He eats and play normally nothing, just would vomit in the middle of the night after he was fed around 830pm. he doesn't really eat in the morning besides eating off the boiled chicken in his bowl and leaving his food. So I was thinking that it could be the new bag of Orijen that I just purchased because all of this vomitting started when I fed him from this bag. I also noticed that the food is darker in color than the usual light brownish and it would not swell up as big as the old one. Also the ingredients now has saltwater fish, I don't remember if this was one of the ingredients in previous bags or is this something new that could be causing it. I've noticed he's also very thirsty too. Any help would be greatly appreciated.

Thank you.
Dee-