I discovered Brat Haus during a Sunday funday and it is such a gem! It is a little farther from Old Town but definitely worth it if you are a big hot dog fan like moi. Their back patio is spacious and inviting with tetherball, ping pong, Bocce ball and large Jenga.
We actually did an event here and they were very accommodating with no food and beverage minimum unlike the other places nearby. The beers are great and the brats are even better. If you don't know what you want, get the brat sliders, you get to sample 3 of their most popular brats and it is very filling. Yes it is a little pricey for a hot dog, but please keep in mind that you are in Scottsdale, real estate is pricey. For vegetarians, fries, the garden burger and pretzels are really your only options. They should look into a veggie dog.