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Answer. First off Filly's cannot reproduce until they come in heat which is usually at 2 and a half. and ther is a difference between Filly's and foals. A filly is a young girl horse that has not reached the age of 3 after they turn 3 they are called mares. A foal is a horse that you donot know what it is. A colt is a boy horse that has not reached the age of 3 after the age of 3 they are called stallions.(That is if you have not Gelded them yet)lol

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17y ago

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