Established in 1948, In-N-Out Burger started life as California's first drive-thru hamburger stand. In-N-Out Burger on Sierra Avenue in Fontana has four pet-friendly tables outside. As the name suggests, their kitchen dishes up a number of different burger options, like hamburgers, combos, and cheeseburgers. Their cheeseburger is made up of freshly baked buns, real American cheese, American beef, onions, lettuce, tomato, and spread. The most appropriate way for you and Fido to enjoy your In-N-out experience may be to order your items Animal style. Animal style burgers are smothered in Thousand Island dressing, mustard and extra pickles, while the fries are topped with cheese, spread and grilled onions. You can accompany your burger with freshly cut fries and one of the shakes: made with real ice cream, including chocolate, strawberry, and vanilla. A drive-thru window is also available if you don't want to tie your dog up outside while you go in to order.