The horse and the cart do pull with equal and opposite forces but that is not the force that moves the cart. The cart is moved because the horses force on the ground is greater than the force of cart on the ground. 
The 3rd Law applies to people (and talking animals) to, mostly in the form of revenge. If you are pushed then you push the person back.
I like the pictures that describes newton's 3rd law. But I thought that you needed more written explanation, other than that I thought the comics was really original
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