Eventually you are going to have more horses than you want and you'll decide it's time to sell some. One of the main reasons people sell horses is to get rid of duplicate horses that run in the same types of races all the time. For example, if you have two males that both like racing in dirt mile races in G2, you'll find yourself having to double them up in races much of the time. Choosing to sell one will free up space for you to take on horses that can enter different races, giving you more variety in your stable, which ultimately leads to more options to earn money and points.
You can sell horses at any time by going to their Manage page and clicking Sell. You can select to put your horse up for public or private sale. Public sales will be listed at a set fee and will be available for instant purchase to anyone who wants to buy them. While you have no control over who gets them, this is usually a more popular option because it tends to get horses sold faster. Private sales allow you to set an asking price for a horse, and then people can make offers either above or below your asking price. This not only creates a flexible sale price, but it allows you to choose where the horse ends up. Private sales are more commonly seen when higher quality horses are being sold - whether to make sure they go to a good home or to try to place them with a newer stable who can benefit more from them. Take note that yearlings can only be sold in the auction for them. If you want to sell one in the public or in private sales you will have to wait until they are two years old.
Flying for Home also hosts Auctions from time to time. We have a Yearling auction each September, and occasionally bloodstock or racing stock auctions as well. In the yearling auction, you will be allowed to consign any yearlings you have bred that you wish to sell. Buyers will be able to watch as many horses as they wish and may bid on up to 30.
In the auction, you can set a starting bid at any amount $50,000 or greater. While you do have control over the minimum price you sell the horse for, you will not have control over who ends up purchasing the horse outside of 3 categories offered: open, novice/amateur only, or novice only. The latter two options give you the chance to sell the horse to a stable who is newer and less successful and may not be able to compete (price wise) with larger stables bidding in the auction. However, if you're extremely picky about where a horse goes, private sales might be a better option - though bear in mind that auctions usually have a higher success rate for getting horses sold (at higher prices).