What are the ongoing expenses of owning a racehorse?

It costs approximately $45,000 to have a horse in training for the period of one year. Included in that expense are charges for training, shoeing, dental, normal vet bills, etc. That computes to about $375/month per 10% of ownership. If and when a horse needs to be turned out to a farm for rest or rehab the cost drops to approximately $85/month per 10%.