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When outdoor cables are exposed to changes in temperature they expand and contract.  This causes them to suck and expel moisture from ends and cracks depending on the temperature changes.  Foam insulation in a cable should stop this kind of thing if that's what you have.  Therefore I suspect the dog.  Not having a drip loop at the point where the cable enters the house may be suspect as well. ( there isn't a sweating cold water pipe over your rig is there).