Originally Posted by Siren
It could be. Some hernias form from trauma when the umbilical cord breaks. Maybe the mare stands up to fast or moves away and pulls the cord at an awkward angle. Some are hereditary. Usually, hernias from trauma are large and need to be corrected or you risk the intestines slipping into the hernia and becoming stuck, causing major colic. If it is a very small hernia that does not involve the abdominal wall, chances are it is hereditary and there is a chance his foals would also be born with hernias.
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I agree! Either case, this is something to speak to your vet about. I wouldnt waste any time either, as you approaching the end of the window for a surgical repair. We had one fixed on a 6 month old several years ago, the surgery was one day and about $1200, so not a big deal. The horse went on to be a great show horse and you can't even see where it was.