Give foals apples to boost their morale+2. Enter races with the lowest % of difficulty and the lowest ranks. Avoid races with special Howrses in them.

Ensure your howrse is at 100% health during training, rides & competitions. 

Problems having a Unicorn foal, timing is correct but you get a uni fail.  

If you conceive & give birth in the same day your unicorn will fail 4/5. 

Try birthing on the next day.

Stroke your howrse when they're at their lowest energy, 

below 10%=12+Energy. 

Feed them when they're at their highest energy, 72%=25%+Energy.