Thanks that looks pretty good.If you take the site's favicon and set that as the icon for your shortcut, it looks pretty good in the dock section:
Here is a link to the favicon: https://www.exophase.com/assets/zeal/_icons/favicon.ico.
Not sure why it doesn't automatically select that version of the icon when creating the shortcut from within Chrome, I'll see if I need to add more sizes or something.