I know that it's low quality food, but he is a dog, not a gourmet. I've had dogs my whole life on 'low quality food' and they've all been as healthy as can be. I have 15 year old dog now, that's been on 'low quality food' for all of his 15 years and he's always been a very healthy, happy, shiny coated dog. Now, at 15, he's a bit stiff, but not unusually so. I have to say that I have a problem with spending tons of money on pets. They are pets. In the wild, they get what they get, in my home, then get considerably better than that. I refuse to spend more on my dogs food than I do on my own.
He's been eating the food for four days with no problem. This issue cropped up very suddenly after he'd been outside for a few minutes. I am wondering if he got bitten by something, or ate a disagreeable bug. He does eat everything he can get his mouth on.