Horses are animals that grow at a very fast rate. Their growth is controlled by their genes that are passed on to the foal. If the foal doesn't get enough feed, it will not grow as quickly as it should and may even stop growing altogether.
If the foal is fed enough, they will grow according to their genetic code and will be healthy adults. However, if they are fed too much or given supplements that promote unhealthy growth, problems can arise such as arthritis and heart disease later in life.
If a foal grows too fast, it can be detrimental to the overall health of the animal. It can lead to problems in bone development and can cause damage to joints. If a foal starts growing too fast, it will need more calories than normal - being fed an extra pound of grain each day or being given more hay.
A foal can also grow too fast if it is fed too much or does not get enough exercise. The best way to prevent your foal from growing too fast is by feeding the proper amount of food and providing adequate exercise.