Challenge a friend see who can do the most push-ups (or exercise of your choice). Loser donates to the dog park.

Get the neighbors to join in the garage sale day!

Clean out those closets and have a garage sale with proceeds to benefit the dog park.

Give up your coffee shop habit and donate the savings.  Pass on the yawns by asking your family and co-workers to do the same. How long can you go without?