Thanks. I know that he would not see external signs at this point of founder, and I feel the reason he hasn't come out to do more for checking that, is he seems to believe, based on what I've said, it isn't founder at all - though I admit, I am not so sure, but I am certainly not trained, and probably have no clue.
I am quite willing for him to come out, but he just seems to think he does not need to at this point.
Here are photos of his back feet - and I think they MIGHT be swollen around the fetlock. The areas are not warm to the touch, not senstive, so maybe I am seeing things because he seemed to favor them - but tonight he seemed in good spirits, but it was late when we got home, and I just changed his stall - seemed to walk fine. Also, he was a buggy horse and his legs are larger from that than average - so I am not sure it is will look swollen to others because of that.
I am emailing these photos to the vet tonight to get his opinion.