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A reader writes: I love dogs, and since my husband died, only my beautiful little Cockapoo saves me from living alone. I couldn't survive without her. I know how many dogs in shelters need homes, and one great no‑kill shelter near me may have to shut down for lack of funds. So I've been thinking a lot about adopting a second dog. But I don't know if it's a good time to bring a new pet into my life.