Other than health related issue... Did he have his items/toys/food with him when you approached? One reason is he's trying to protect something. Dog growling is a warning method and if you keep on approaching after the warning, it would escalate to snapping and biting. I'd say keep notes of whenever he growls at you so you could determine the reason he's reacting that way. Get a trainer if you can afford one. Please keep us updated.
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