Know what changes, and when.

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  When Is a Cat Actually a Senior? The Four Life Stages Vets Use

  Cats get an actual number, unlike dogs. It is ten. The stage just before it is the one almost nobody writes about, and it is where most of the useful years sit.
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  When Is a Dog Actually a Senior? The Rule Vets Use That Nobody Explains

  Seven is the number everyone repeats. It is not the rule vets use. Here is the real definition, where it comes from, and how to work it out for your own dog.

For Dogs

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  At What Age Is a Doodle a Senior Dog?

  Nobody has ever measured how long a doodle lives. Size answers this question and the word doodle does not, and here is what that means for your dog.

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  At What Age Is a Chihuahua a Senior Dog?

  Later than almost any breed, but the published numbers disagree with each other more than for any other dog. Here is both answers, and which signs actually arrive first.

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  At What Age Is a Labrador a Senior Dog?

  Around nine, from real breed records. Plus the gene that makes this breed hungrier and slower-burning, and what that means for the years before.
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  At What Age Is a German Shepherd a Senior Dog?

  Seven and a half, from real breed longevity records. Plus the mortality figure that no consumer article seems to publish.

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  At What Age Is a French Bulldog a Senior Dog?

  Around eight or nine by the standard rule. Also the breed where that number helps you least, and the lifespan figure you have probably seen is misleading.

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  At What Age Is a Golden Retriever a Senior Dog?

  Around eight, and here is the arithmetic. Plus why the two years before that matter more, and the one early change worth learning to spot.

For Cats

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  At What Age Is a Ragdoll a Senior Cat?

  Ten, like every cat. The breed finally has a study of its own, and it corrects two things the breed pages have been telling you.

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  At What Age Is a Persian a Senior Cat?

  Ten, like every cat. Three published lifespan figures for the breed disagree with each other, and here is why all three are right.

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  At What Age Is an Exotic Shorthair a Senior Cat?

  Ten, like every cat. Nobody has measured this breed, but the registries define it as a Persian in all but coat, and the Persian record is good.

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  At What Age Is an American Shorthair a Senior Cat?

  Ten, like every cat. But this breed appears in no veterinary dataset at all, and the 15 to 20 year figure you have seen is not a measurement.

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  At What Age Is a Maine Coon a Senior Cat?

  Ten, the same as every other cat. The largest common breed is no exception, and nobody has ever tested whether size matters in cats. The weight curve turns at seven.