I run Google Calendar as a SSB application, made by Fluid. When you set up the app, it allows you to use the website favicon, which I chose. But the dock icon is not the same as the favicon I see next to my browser URL; Google recently made its Calendar icon dynamic; it changes every day to show the day of the month on a calendar. I want that displayed in my dock so I can glance at the icon and it tells me the correct date.

Any idea how to get the favicon displayed on the webpage to display in the dock?