Older dog pees everywhere?

So my sister has got 2 dogs, both are older. My mom has been taking care of them for a long time. They WET everywhere, so I know we are gonna have to deep clean everything. Sophia is the oldest. She doesn't like anyone. she's 16, and still kicking it. But she wets on her beds, and I had put her in her cage and she peed on everything in 4 hours. So, what do I do? Do I get her diapers? I brought her in my room during the cold season cause she's very fragile. Any suggestions?
Older dog pees everywhere?
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