The best indoor cat foods include dry and wet formulas for kittens and seniors. Our top picks are made by Purina, Iams, Hill's, and more.

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The best natural cat litters control odors and form solid, easy-to-scoop clumps. Our top picks include eco-friendly multicat corn and wood litters.

The overall monetary values they report can be as high as £70,000 (about $94,000) for both cats and dogs, and dogs had larger health benefits than cats. They note, "It may be that a larger value ...