Oh, Robin, I wish I lived closer to you! I think any one of us would be glad to come to your house and walk your dogs and clean your litterboxes and try to talk some sense into Polli! Seriously, as well as being nauseated, she could be feeling your stress about the not eating situation. I agree that you might try stepping away from the supper dish too. Don't push the variety too hard, and try again later. This is the hideous part of chemo. It is such a roller coaster, and when we're going through it, it's natural to obsess. You just become consumed with it, and it's much easier said than done to not let that happen.
Please keep us posted, and know that you and Polli are in our prayers.