Have a court trial over dog shit, need advice.

Oregon

Neighbor claims one of my dogs defecated on his lawn. He took a picture of a dog taking a dump, called the cops and insisted on a citizens citation(?). Officer came and showed me a picture of a dog taking a dump and asked if it was mine. I told him it was the same breed and that it could be, I would check the fence and make sure there where no holes. I was mailed a citation a few weeks later, went to court, said not guilty and now have a court trial.

This is fucking ridiculous. He never talked to me or informed me that he thought my dog shit in his yard. I figure if I am gonna get stuck with a fine I will make him prove it. How should I handle this? Getting a lawyer seems silly and there is no way in hell he can prove it was mine and not one of the other 6 wiener dogs on the block. Do I just stay quite and hope the judge dismisses this or should I prepare for more than a basic statement? Should I take in pictures of other dogs butts and see if he can pick mine out? How can I have some fun here?