Each of the parks has kennel facilities. If you are a resort guest, you may board your pet overnight. The closest facility to the Boardwalk/Beach Club area would be MGM. Since there is a walkway, you could walk over.
We took our dog once, and boarded her at AK. I believe it was $9 or $10 for overnight. You were able to go in anytime and get them to take them for a walk. I liked AK, because we could go over at night, and there was a decent amount of grass area there.
The only thing I didn't like was that there were no windows in the facility, and they shut the lights out in the kennel room at 6:00 at night. There was only a small light in one of the rows that did not illuminate the other rows. I felt like our dog was being left in the dark from 6:00 pm until probably 7:00 am when then staff came in.