The Arizona Diamondbacks have a pets in the park program that we attend. You get your own box seat type gated area for 4 people and your dog. You get all you can eat hotdogs, popcorn, peanuts, chips, soda, and water. There is a potty-zone for your animal. Each gated box has a table and seating for four. It is a great idea and my Mom who goes everywhere with her dog has a blast.
When you consider that a large Coke costs $6 not to mention all the other costs of the all-you-can-eat goodies its a great deal at $55.00 a ticket.
Maybe they have something like this at your MLB ballpark?