South Africa Law
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You are actually not obligated to contribute to the fence. Section 11 of the Fencing Act says the following:
11. Alteration of boundary fences.—An owner may at any time alter any boundary fence in respect of his holding so as to make it a fence of a superior type: Provided that the owner of the adjoining holding separated by such fence shall not be liable to contribute to the alteration unless and until he derives beneficial use from the type of the fence as altered.
So you would only have to contribute if you too, start to keep game for commercial purposes.
Whether you are obligated to have a fire path on your land to protect the fence should be cleared up at your local fire station/municipality.
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