Thanks to each of you for your responses. I did further research online (after I found the time) and discovered that diarrhea can indeed be a side effect of the chemo.
Guess I should edit Buzz' stats; he HAS a PEG, but as of now has not needed it. I'm sure that will change soon.
I've encouraged Gatorade and other liquids all day, and he ate a whole banana. Tomorrow begins week 3..pray that all goes well!
Lois