What are the signs of a pregnant horse's udders developing and how can one differentiate between a pregnant horse's udders and those of a non-pregnant horse?

Signs of a pregnant horse's udders developing include swelling, firmness, and increased size. To differentiate between a pregnant horse's udders and those of a non-pregnant horse, look for consistent growth and changes in the udders over time, as well as the presence of milk or colostrum closer to the due date. Consulting a veterinarian for confirmation is recommended.