One major rule of condo living is you absolutely must pick up your dog's poo every single time! If you miss a single episode of poo, your neighbor will find it, bag it and hang it on your door knob.
Sometimes a small dogs poo will just disappear into the lawn. You could be standing right next to him with a flashlight, look away for a second and be completely unable to find the dogs poo. You say to yourself, that's okay I'll just find it in the morning but the next day, the poo is hanging on your door knob.
You've lived next to the same neighbors for 7 years, they know your dog and his poo so they know it's your poo. There is no sense denying it. You just need to do your diligence and find your dog's poo before the neighborhood poo police do.
It's just a fact of life.