from Philip J. Skuce writing in Essentials of Veterinary Parasitology:
Dicrocoeliosis is caused by Dicrocoelium dendriticum, which is also known as 'lancet fluke' or 'small liver fluke'. It can infect sheep, goats, cattle, deer and rabbits, and occasionally horses and pigs. Dicrocoeliasis is a widespread problem worldwide in grazing livestock. The epidemiology of Dicrocoelium depends upon the environment and on the presence of its intermediate and definitive hosts. Dicrocoelium spp. do pose a zoonotic risk but are very uncommon in humans, most cases are likely to be non-symptomatic.
Further reading: Essentials of Veterinary Parasitology