Stranded Pets...?

I see quite a few stranded servers with a pet system, most players tell me it was a system made in the earlier versions of stranded but i can’t find it anywhere, anyone have any idea where they might have gotten it from? I don’t care if it’s for a different version of gmod I would like to update/fix/use it as a reference.

There were never pets in earlier stranded versions, it’s an addon.