Idk the combination of the white text followed by black text within an orange rounded rectangle logo when paired with tag lines like 'get stuffed' might lead people to think it's a subsidiary or something similar.

A place known for it's sausages and a restaurant may seem like a strange business partnership but stranger things have happened.

Yeah but if you don't sue, a legitimate infringer in the future might use not enforcing on the trademark there to argue there own case. Trademark law really doesn't leave trademark holders in a good position. Though I imagine that a lawsuit when those laws were written weren't nearly as prohibitively expensive.

Pretty sure it would have to be determined in a court of law that an infringement occurred in the first place.