Deadly Dog-Killing Flatworm Discovered in Southern California

The dog-killing Heterobilharzia americana parasite, previously only found in Texas and nearby states, has been discovered in California, posing a threat to dogs in the region. The flatworm, which causes canine schistosomiasis, was found in snails along the Colorado River. Symptoms of infection include loss of appetite, vomiting, diarrhea, and weight loss. While not harmful to humans, the parasite has impacted 11 dogs in California since 2019, prompting warnings for dog owners to be cautious about where their pets swim.