I decided to cheat and use the existing character template for animal companions because it has all the necessary bits in there. I renamed it so that it would not conflict with the actual character template.

You can see an example on Finnian's sheet.

Here is the link to the L4W:Companion Template.

Before I go too much further, I should probably tweak this to make sure it covers everything for animal companions and maybe it should cover familiars as well.

I would love to get feedback on what information is required for animal companions and familiars so I continue to improve this template.