Gross factor aside, not picking up dog poop is bad for the environment, it contaminates water and is harmful to people and other animals.
Dog poop, like human waste, is full of nutrients that contribute to excessive algae growth in local ponds, lakes and streams. Dog poop also contains bacteria, viruses and other pathogens like roundworms that can be transmitted to humans and other wildlife. As dog poop is left to decompose in the grass, those nutrients and pathogens can be washed into local waterways during a rain fall and contribute to local water quality degradation.
Make a commitment to pick up dog poop every time, everywhere and dispose of properly. Keep extra bags on hand. Dispose of in a trash can. Do your part to protect local water quality.