T-posts for a barrier? I have a miniature horse, and Im going to be in...

I have a miniature horse, and Im going to be in motion and build a new blockade for her this weekend. Pippin is only 30inches elevated at the shoulder. If I use 3foot high chain fence, how long of a t-post should I buy? 4foot?3foot? I plan on making a 20'x20'fenced nouns for her. How far apart should the t-post spacing be?
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Answers:    I would get the 4 foot, so you can enjoy more to drive into the ground, space them about 6 ft apart.
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The post want to be at least 4 foot, set the posts something like 5 feet apart, and use wood for the corners and use a late man and corner bracing. Other wise the wall won't last a season. Any horse will lean on the posts and the lead, just to rub.
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