Place for dogs to pee?


My sister is on oxygen and just moved to a 1st floor apartment. She has 2 little dogs. Her outside is a long balcony on one side then a huge deck connected to other deck but faces a different way. Are there any ideas she could use so she can just let them out to do their business but not harm the deck? I suggested patio stones with turf in one area. Any ideas would be appreciated.

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