How many pigs can I keep in a single pen at once?

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In Farm and Grow, how many pigs can you have in one pen at the same time? I could get one,but I can't seem to be able to buy any more.
Best Answer
Up to four animals of one kind fit in a pen. To get the second one you need to go to market repeatedly until you find a matching pair.
Once there are at least two animals in a pen, new ones will spawn autonomously.
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How to Move pigs from one Pen to Another
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