You've got to click settings and display all the columns. "dog" is a substring of the company name. Here's the filtering code; it's just a JavaScript `indexOf`:
In our case, we needed to filter on hidden columns (as we still cared about the data behind the scenes), but I'm thinking that this is something that should be optional.
https://github.com/DynamicTyped/Griddle/blob/master/scripts/...