Neospora canium is a protozoal infection, similar to Toxoplasma gondii in sheep.
The life cycle of this parasite is complex and involves the dog as the definitive host. The dog then passes oocysts in faeces. These oocycsts are eaten by cattle grazing land on which dogs have had contact (often from dog walking). Infection in the cow usually results in abortion in the second half of the pregnancy.
This disease was recognised in the mid 1980s and incidence of infection varies within herds but Neospora abortion has been reported in most parts of the world.
Histological analysis of the aborted foetus is important in order to determine the cause of the abortion. Careful disposal of any infected material is important in order to avoid infecting other animals. Please contact your vet for more information.