I wouldn't drop them unless I hated the yard and it didn't pay well. I live in the country and have 4 dogs. My yard is like a mine field. Most of my customers are in the country and have one or two dogs as well. Dog poo doesn't bother me so much unless it gets stuck in the tire treads. But I just deal with it. One of my properties has horse poo on the lawn sometimes. I just mow around that or scoop it up for the lady if I feel like it.