Mike,
If it is the foxtail that is making Eddie sneeze, I don't understand how antibiotics would help. Maybe the vet prescribed antibiotics in case the sneezing is caused by something else????
I watched the video, and except for the sneezing, Eddie looks GREAT. In fact, it doesn't look like you are holding back on the kibble, if you know what I mean. Maybe he's just getting a little fluffy
Your summers sure are short. Leaves falling from the trees already.