Foalhood is the prime time for fluffies to learn new concepts and develop their little personalities. If you are raising a fluffy without a fluffy mother present then it is best to start early with training & disciplining, otherwise the foal might become too full of themselves.
If a bio-toy has grown enough to respond to vocal commands and doesn’t respect or try to remember the rules - a swift punishment like pinching the fat on their sides or taking away the toys for a few minutes will help them correct that behaviour.
Remember to be gentle - they are still foals afterall.