Humans can be exposed to pathogens from poorly managed animal feces, particularly in communities where animals live in close proximity to humans. ... Exposure to animal feces has been associated with diarrhea, soil-transmitted helminth infection, trachoma, environmental enteric dysfunction, and growth faltering

Beyond your grass, it has been estimated that a single gram of dog waste can contain 23 million fecal coliform bacteria, which are known to cause cramps, diarrhea, intestinal illness, and serious kidney disorders in humans. ... Dog feces are one of the most common carriers of the following diseases: Whipworms. Hookworms.

From bacteria
The illness typically lasts one week but for people with compromised immune systems, Campylobacter can spread to the bloodstream and result in a life-threatening infection. E. Coli and other fecal coliforms live in the intestines of many animals.