Consider charging an admissions price or asking for a suggested donation. You can plan something as simple as a barbecue or host an event tailored to your cause. Why not plan a 5 kilometer walk or run, and encourage owners to participate with their dogs? Ask participants to find sponsors who would be willing to donate a certain amount based on how fast they run the event. You could give out prizes for the dog-owner pair that finishes first, as well as for other superlatives, such as best dressed, most enthusiastic, or most raised. Publicize your event on your crowdfunding page, and have people RSVP by posting in the comments section.