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SESK: Stuff Everyone Should Know · sesk.info/dog-senior-life-stage

Per AAHA, a dog becomes a senior when it enters which part of its estimated lifespan?

The last 25% of its estimated lifespan.

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  1. The last 25% ✔
  2. The first 25%
  3. The middle 50%

Why: A senior stage depends on breed and size because bigger dogs tend to age faster. AAHA defines it as the last quarter of the expected lifespan.

Huh, didn't know that: AAHA's other stages: puppy, young adult and mature adult.

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References

Answer: The last 25%. A senior stage depends on breed and size because bigger dogs tend to age faster. AAHA defines it as the last quarter of the expected lifespan.

  1. AAHA, Canine Life Stage Guidelines www.aaha.org/resources/life-stage-canine
    Last 25% of estimated lifespan
    Checked 2026-10-10.

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