− | All domestic species of all ages may be affected but foals may be particularly susceptible due to the possibility of infection through the umbilicus. Mares with a retained placenta post-foaling may also be affected. | + | All domestic species of all ages may be affected but horses are the most sensitive of the domestic species. Foals may be particularly susceptible due to the possibility of infection through the umbilicus. Mares with a retained placenta post-foaling may also be affected. Cats and dogs have a higher natural resistance to tetanus toxin, and these animals may have a longer incubating period and a localised (rather than generalised) tetanus. |