Overdue in horses is considered anything beyond 345 days.
However, it's important to note that:
* A mare can be overdue for a week or two and still deliver a healthy foal.
* There's a wide range of "normal" in horse pregnancies. Some mares might be overdue for a few days, while others might be a week or two late.
* Veterinary monitoring is crucial for mares overdue beyond 345 days. They can help assess the foal's health and recommend interventions if necessary.
If you have a mare who is overdue, it's important to consult with your veterinarian. They can help determine if the mare is truly overdue and recommend the best course of action.