Clearly horses are your stables main asset! You must have a minimum of 4 horses in your stable at all times.
Each horse has attributes and skills that determine their overall racing ability, while there are also some additional factors that will affect their performance in different race situations. The horses also have an 'Overall Rating' which is a quick way to compare horses, as well as having experience at different Distances and Track Conditions.
It's your job to consider the strengths and weaknesses of your horse, and decide which horse is best for each event. Each attribute of the horse will affect it in different ways - as will the balance between each attribute.
Aside from racing your horses, you'll also need to take care of their training needs and their veterinary care to make sure you always get the most out of them. (See Vet services, and also Training). After racing and training you'll notice the physical condition of the horse will decrease. Medical condition decreasing is often a sign that your horse has picked up an injury - in races, this is reported in the Form Guide after the race.
If your horse is getting repeatedly injured, or if your horse has a lower 'Vet Assessment' than you would expect, then maybe you might consider giving your horse a spell (rest) to allow the horse time to heal naturally? This can be a very effective tool to continue to get the best from your horses.
Injury Profiling, commonly referred to as IP, is a measure of how likely your horse is to sustain an injury next time it races or trains. There is no direct display of this stat, but you can estimate this by looking at the Vet Assessment. If it seems much lower than the average of Medical/Physical condition, then the horse is at a high risk of injury from being too active recently, or because of a recent injury that might be made worse. The best way to help your horse recover if it has a poor Vet Assessment is to give it a spell (ie a rest) from training and racing. A spell of 3-4 weeks is enough for any horse to recover, but your horse might not need that much of a rest? It's your decision!
Some General Guidelines for Injury Profiling
As you'll notice, a horses week can get very busy! Be sure to keep an eye on the Upcoming Schedule for each of your horses, to make sure that they don't have any conflicts. Where there is a conflict in schedule, the horse will simply take the earliest thing that you have told it to do and go with it - even if that means missing out on training or missing out on a race, or even missing travel arrangements to another track. Of course, if a horse misses its travel, it might not make the next race or get home in time for training etc.....so it can have quite a big flow-on effect. Any Schedule conflicts are highlighted in the horses' Upcoming Schedule, so they shouldn't be hard to notice! If you see any, you can remove the conflicting item/s by going into the "Schedule & Transport" page for that horse, and cancelling them directly from the schedule.
It's also possible to rename your 2yo horses, any 3yo's that were bought within the past 3 weeks, or any horses with career earnings of less than $1,000,000. It costs 1 'Game Credit' for each time you want to rename a horse. The number of Game Credits you have is displayed on the 'Home' page, and Game Credits can be bought through the Shop, or are provided free with purchases of Owners Club (See Owners Club). To rename a horse, simply select the colt/filly that you want to rename, and then select the Rename a Horse link from the Page Menu. A member of staff from Track King will approve or reject the renaming as appropriate within 24-48 hours at most!
And finally, the great circle of life! Each season, on the first day of January/April/July/October, horses will be considered as one year older - regardless of their actual date of birth. As a general rule, horses may only race from the age of 2yo (3yo for league races) up to and including 10yo. After 10yo, stallions may continue to be used for Stud until (and including) the age of 12yo. After age 12yo (or age 10yo for geldings or mares), there isn't really anything useful for your horses to do around your stable, although a mare will still give birth to a foal as an 11yo provided she was serviced before her 11th birthday. It might break your heart to part with these virtual champions, but in the interest of your stable it should probably be done. You can either organise to give them away, or if you are an Owners Club member you can retire them into the Hall of Fame, so that we can all look back at their stats and achievements. (See Owners Club)