7th Avenue Pet Food [http://www.yelp.com/biz/7th-avenue-pet-food-brooklyn] (445 7th Ave), which has been a neighborhood institution for the past ten years, is for sale. A Craigslist ad [http://newyork.craigslist.org/lgi/bfd/3540765215.html] from East Coast Stores [http://www.eastcoaststores.com/] lists the business for