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In the early 90's, I had the honor of corresponding with "Uncle Frank" Webster [1], the curator of the Hot Dog Hall of Fame [2]! It boasts of more than 2,500 frankfurter items, including the Lamborweenie, a dog on wheels that "Uncle Frank" hopes some day to race against the Oscar Meyer Weinermobile [3]. Unfortunately the hot dog museum is currently closed and in (hopefully refrigerated) storage [4], otherwise the museum, gallery and gift shop would be a great place to train your app.
He asked for permission to publish in his newsletter a gif [5] of a photo I'd taken and put on my web site of the Doggie Diner head [6] on Sloat Boulevard in San Francisco [7]. (This was years before John Law acquired all the Doggie Diner heads he could find for his restoration project [8], so there weren't so many photos on them on the internet at the time.)
Of course I gave him permission because he asked so politely, and although at first he seemed a little creepy, I could tell he was authentic and sincere since he signed his correspondence: "With Relish, Uncle Frank." [9] And he even delivered on his promise to send me copies of his newsletter!
He enthusiastically informed me that the highest quality hot dogs he's ever found are from Top Dog in Berkeley [10]. He admitted that he went through their dumpster to find out where they sourced them from because they wouldn't tell him, and he vouches that they are made from the finest possible ingredients. I agree with Uncle Frank that Top Dog has really excellent hot dogs (ask for them cooked butterfly style), and I take him at his word that they come from a reputable source. You can now actually order them online [11] if you would prefer not to go through their dumpster.
[1] http://www.smithsonianmag.com/arts-culture/hot-dogs-are-us-6...
[2] http://thehotdoghalloffame.blogspot.nl/
[3] https://www.questia.com/magazine/1G1-19007874/the-almost-all...
[4] http://www.roadsideamerica.com/tip/20747
[5] http://donhopkins.com/home/catalog/images/DoggieDiner.gif
[6] https://en.wikipedia.org/wiki/Doggie_Diner
[7] http://www.roadsideamerica.com/story/14441
[8] https://www.kickstarter.com/projects/2118888480/doggie-diner...
[9] http://www.downtownmakeover.com/comments.asp?CZID=17