「イヌワラウ」という、おもしろい名前の食堂でした。
「戌笑う」で、相場が活気づいて笑いが止まらないこと、だそうです。
商売繁盛の願いを込めた店名みたいですね。

It was a dining hall with the intereting name "The Dog Smiles".

I hear it's the (Year of the) Dog smiling, meaning the market prices are active and the smiles don't stop. It seems the store name was made with a wish for thriving business.