Marmaduke smells a ham that had just finished cooking and put on the table. Mrs. Winslow grabs it just before Marmaduke can and tells him that he will just have to wait for leftovers. The mail man comes by just as Marmaduke takes a nap. He tosses Marmaduke a bone to distract him and runs the mail up to the door. As the mail man runs off he runs into Marmaduke who give him a big sloppy lick and causes all the letters to fly out on to the ground.
The mail is a notice of the veteran's BBQ being held at the park and Mr. Winslow thinks that it would be good for Marmaduke to go. Marmaduke overhears him and thinks that he is going to take him to the veterinarian and runs to hide. A long and comical chase ensues and doesn't end until Mr. Winslow is finally able to put a leash on Marmaduke's collar and Marmaduke runs toward the park when he smells food. Marmaduke stops to grab a steak and Mr. Winslow goes flying into the shrubs.
It turns out that they made it to the veterinarian BBQ and the veteran's BBQ was just past the shrubs. Marmaduke hears the word veterinarian and runs off with Mr. Winslow in pursuit.