Is there a law on the books regarding proper cleanup after your dog? Not cleaning up your dog’s poop is considered littering, Gainesville officials said. The specific portion of city law for this prohibits residents from having “any accumulation of offensive matter or odor including, but not limited to, overgrown or dead or decayed trees, dead organic matter, rubbish, garbage, animal intestinal waste and urine, and toxic or otherwise hazardous liquids and substances and material.”