I'm starting to get worried about Jasper. He hasn't really eaten his regular meals in a couple days, and this is a dog that will eat absolutely anything at any time and usually wolfs down his food like he may never get fed again. He has taken treats from my hand, without much enthusiasm, but won't touch his regular food. My other dog is still eating normally, so I tend to doubt that it's a bad bag of food. We took him to the vet for a full physical, and the vet didn't find anything wrong at all. 

I noticed last night that when he went to pick up a pine cone from the ground, he let out a little yelp, but pushed and prodded all over him without any reaction at all. I've looked in his mouth too, and pushed on all of his teeth without any reaction from him. I'm baffled, and starting to get worried. 

Well, I did the chicken and rice and he ate some of it, reluctantly. Yesterday he ate most of his food though, and this morning he wolfed it all down, so it seems like he's back to normal. I did notice that he had some pretty runny stool on Saturday, so perhaps he just had a stomach virus.

Thanks for all the advice.

I'm in north-central Idaho. Heat hasn't really been an issue here yet.

Yeah, he got better just as my two year old son came down with a fever. If it isn't one thing, it's another.