A post by PetMD has me waiting for tomorrow's follow up. It's a summary of a study about the effect human actions would have on a dog choosing between a bowl with a big serve of food and one with a small serve of food. The degree of interest the human showed in the food is varied, and so is the type of gesture the human made towards the bowl with less food. I've read part one.
I reckon Penny would go for the big bowl, whatever, but I'll be interested to read part two, tomorrow.
If it looks fairly easy to do, I might run the test by Penny.