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Source study found

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Here's more evidence your dog might lengthen your life | American Heart Association (opens in a new tab)

heart.org · 2019-10-08

Short answerEvidenceSource

Short answer

Mixed

Mixed.

One claim goes further than the study. One other point was not covered by the paper.

  • 3 supported
  • 1 overstated
  • 1 not covered

Checked against the study summary. The full text wasn't available, so some details couldn't be settled either way.

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Follow the evidence trail
1
2

NewsLink checks it

Mixed

One claim overstates the study. Three of five check out. One claim the study doesn't address.

  • 3 supported
  • 1 overstated
  • 1 not covered
Open claim evidence
3
Source paper

Source layer

The 3 papers the story cites

Source study separated from background citations.

The research anchor for the report.

Then inspect each claim

Evidence layer

Claim by claim

Each claim gets a verdict. Expand it to see the evidence directly below.

5 claims in this story

Showing all 5 claimsChoose a verdict to focus the list.

Claim 1 of 5OverstatedNew research bolsters the association between dog ownership and longer life, especially for people who have had heart attacks or strokes.View evidenceHide evidence

Why this verdict

The paper abstract supports an association between baseline dog ownership and lower all-cause mortality, and reports a stronger association in people with prior coronary events. However, the claim’s headline framing extends this especially-strong association to people who have had heart attacks or strokes; the supplied abstract-level profile specifically reports the subgroup result for prior coronary events, not stroke. The headline therefore slightly outruns the paper evidence available here.

1

Study evidence

Pooled estimate across included observational studies: dog ownership associated with lower all-cause mortality.RR 0.76 (95% CI 0.67–0.86)

“Thus, we performed a systematic review and meta-analysis to evaluate the association of dog ownership with all-cause mortality, with and without prior cardiovascular disease, and cardiovascular mortality.”
2

Study evidence

Among participants with prior coronary events, dog ownership was associated with lower all-cause mortality in the meta-analytic subgroup (relative risk 0.35; 95% CI 0.17–0.69; I2 = 0%).RR 0.35 (95% CI 0.17–0.69)

“Notably, in individuals with prior coronary events, living in a home with a dog was associated with an even more pronounced risk reduction for all-cause mortality (relative risk, 0.35; 95% CI, 0.17-0.69; I2, 0%).”
Claim 2 of 5Not coveredIn a Swedish study of people after heart attack or stroke, dog owners had lower risks of death than non-owners, with larger reductions among those who lived alone.View evidenceHide evidence

As stated33% lower risk after heart attack for dog owners living alone; 15% lower if living with a partner or child; 27% lower risk after stroke for dog owners living alone; 12% lower if living with a partner or child

Why this verdict

The paper abstract supports only a broader subgroup finding that dog ownership was associated with lower all-cause mortality among people with prior coronary events. It does not provide the claimed Swedish-study details, stroke results, living-alone stratification, or the specific 33%, 15%, 27%, and 12% reductions. Those details may come from another study discussed in the story, but they are not verifiable from the supplied abstract-level paper profile.

1

Study evidence

Among participants with prior coronary events, dog ownership was associated with lower all-cause mortality in the meta-analytic subgroup (relative risk 0.35; 95% CI 0.17–0.69; I2 = 0%).RR 0.35 (95% CI 0.17–0.69)

“Notably, in individuals with prior coronary events, living in a home with a dog was associated with an even more pronounced risk reduction for all-cause mortality (relative risk, 0.35; 95% CI, 0.17-0.69; I2, 0%).”
Claim 3 of 5SupportedThe studies cannot prove that adopting or owning a dog directly leads to reduced mortality, although the findings are described as at least suggestive.View evidenceHide evidence

Why this verdict

The paper profile states that the evidence came from observational studies and lists as a limitation that such evidence cannot establish causality and that analyses were not adjusted for confounders. A hedged statement that the studies cannot prove dog ownership directly reduces mortality is consistent with the paper’s limitations.

1

Study evidence

Pooled estimate across included observational studies: dog ownership associated with lower all-cause mortality.RR 0.76 (95% CI 0.67–0.86)

“Thus, we performed a systematic review and meta-analysis to evaluate the association of dog ownership with all-cause mortality, with and without prior cardiovascular disease, and cardiovascular mortality.”
2

Study evidence

Among participants with prior coronary events, dog ownership was associated with lower all-cause mortality in the meta-analytic subgroup (relative risk 0.35; 95% CI 0.17–0.69; I2 = 0%).RR 0.35 (95% CI 0.17–0.69)

“Notably, in individuals with prior coronary events, living in a home with a dog was associated with an even more pronounced risk reduction for all-cause mortality (relative risk, 0.35; 95% CI, 0.17-0.69; I2, 0%).”
Claim 4 of 5SupportedA second analysis pooling more than 3.8 million people in 10 studies found that dog owners had lower risks of death from any cause, cardiovascular causes, and after a heart attack.View evidenceHide evidence

As stated24% reduced risk of all-cause death; 31% reduced risk of cardiovascular death; 65% reduced risk of death after a heart attack

Why this verdict

This closely matches the supplied paper profile: a systematic review/meta-analysis of 10 observational studies with 3,837,005 participants found lower all-cause mortality among dog owners (RR 0.76, equivalent to a 24% lower risk), lower cardiovascular mortality (RR 0.69, 31% lower), and a larger association among people with prior coronary events (RR 0.35, 65% lower). The story’s wording of the last result as death 'after a heart attack' is a simplification of the paper’s 'prior coronary events' subgroup, but the magnitude and direction match the abstract-level evidence.

1

Study evidence

Pooled estimate across included observational studies: dog ownership associated with lower all-cause mortality.RR 0.76 (95% CI 0.67–0.86)

“Thus, we performed a systematic review and meta-analysis to evaluate the association of dog ownership with all-cause mortality, with and without prior cardiovascular disease, and cardiovascular mortality.”
2

Study evidence

Among participants with prior coronary events, dog ownership was associated with lower all-cause mortality in the meta-analytic subgroup (relative risk 0.35; 95% CI 0.17–0.69; I2 = 0%).RR 0.35 (95% CI 0.17–0.69)

“Notably, in individuals with prior coronary events, living in a home with a dog was associated with an even more pronounced risk reduction for all-cause mortality (relative risk, 0.35; 95% CI, 0.17-0.69; I2, 0%).”
Claim 5 of 5SupportedThe article says the study did not account for factors such as better fitness or a healthier lifestyle that could be associated with dog ownership, and it cautions that dogs should only be acquired by people who can give them a good life.View evidenceHide evidence

Why this verdict

The paper profile supports the confounding caveat: it states that the included evidence was observational and that analyses were not adjusted for confounders. The animal-welfare advice is not a scientific finding evaluated in the supplied paper profile, but it is an external caution rather than a contradiction of the paper evidence.

1

Study evidence

Pooled estimate across included observational studies: dog ownership associated with lower all-cause mortality.RR 0.76 (95% CI 0.67–0.86)

“Thus, we performed a systematic review and meta-analysis to evaluate the association of dog ownership with all-cause mortality, with and without prior cardiovascular disease, and cardiovascular mortality.”
2

Study evidence

Among participants with prior coronary events, dog ownership was associated with lower all-cause mortality in the meta-analytic subgroup (relative risk 0.35; 95% CI 0.17–0.69; I2 = 0%).RR 0.35 (95% CI 0.17–0.69)

“Notably, in individuals with prior coronary events, living in a home with a dog was associated with an even more pronounced risk reduction for all-cause mortality (relative risk, 0.35; 95% CI, 0.17-0.69; I2, 0%).”
Then look for missing context

Context layer

What the story carried across

Nothing material from the study was dropped.

6 things the story did carry across
  • The paper is a systematic review and random-effects meta-analysis of observational studies of baseline dog ownership and subsequent mortality, with 10 included studies and 3,837,005 participants.
  • Overall pooled finding: dog ownership was associated with lower all-cause mortality, RR 0.76 (95% CI 0.67–0.86).
  • Subgroup finding: among individuals with prior coronary events, dog ownership was associated with lower all-cause mortality, RR 0.35 (95% CI 0.17–0.69; I2 = 0%).
  • Cardiovascular mortality finding: dog ownership was associated with lower cardiovascular mortality, RR 0.69 (95% CI 0.67–0.71; I2 = 5.1%).
  • Major limitation: the evidence base was observational and cannot establish that dog ownership causes lower mortality.
  • Major limitation: the abstract notes analyses were not adjusted for confounders, leaving possible residual confounding.
Then read the study layer

Study layer

Study at a glance

Scan the study first. Expand only the parts you want to inspect.

Pieces of work

3

Evidence read

study summary

Lead result

secondary data

1Lead resultsecondary dataSynthesize observational evidence on whether baseline dog ownership is associated with lower all-cause mortality in the general population.Systematic review and random-effects meta-analysis of observational studiesExpand

In plain English

Registered systematic review and random-effects meta-analysis of observational studies evaluating baseline dog ownership and subsequent mortality. Ten studies (3,837,005 participants, 530,515 events, mean follow-up 10.1 years) were pooled. Dog ownership was associated with lower all-cause mortality (pooled RR 0.76, 95% CI 0.67–0.86). Stronger association reported for people with prior coronary events (RR 0.35, 95% CI 0.17–0.69; I2 = 0%) and for cardiovascular mortality (RR 0.69, 95% CI 0.67–0.71; I2 = 5.1%). The review used PubMed and Embase searches through May 24, 2019, duplicate data extraction, and random-effects meta-analysis. The authors note as a possible limitation that analyses were not adjusted for confounders.

Key findings

  • Pooled estimate across included observational studies: dog ownership associated with lower all-cause mortality.RR 0.76 (95% CI 0.67–0.86)
  • Among individuals with prior coronary events, living in a home with a dog was associated with substantially lower all-cause mortality.RR 0.35 (95% CI 0.17–0.69)
“Thus, we performed a systematic review and meta-analysis to evaluate the association of dog ownership with all-cause mortality, with and without prior cardiovascular disease, and cardiovascular mortality.”
What this piece can’t prove
  • Included evidence comprised observational studies, which cannot establish causality.
  • Abstract states analyses were not adjusted for confounders (possible residual confounding).
  • Abstract does not provide detailed information on individual study adjustment sets, study designs, or the number of studies contributing to each subgroup estimate.
2secondary dataAssess whether the association between dog ownership and all-cause mortality differs in people with prior cardiovascular disease/coronary events.subgroup meta-analysisExpand

In plain English

Within the systematic review and meta-analysis, a stratified pooled estimate for participants with prior coronary events found dog ownership was associated with a substantially lower risk of all-cause mortality (reported RR 0.35, 95% CI 0.17–0.69; I2 = 0%). This subgroup analysis was conducted as part of the review's meta-analytic framework of observational studies.

Key findings

  • Among participants with prior coronary events, dog ownership was associated with lower all-cause mortality in the meta-analytic subgroup (relative risk 0.35; 95% CI 0.17–0.69; I2 = 0%).RR 0.35 (95% CI 0.17–0.69)
“Notably, in individuals with prior coronary events, living in a home with a dog was associated with an even more pronounced risk reduction for all-cause mortality (relative risk, 0.35; 95% CI, 0.17-0.69; I2, 0%).”
What this piece can’t prove
  • Analyses are based on observational studies; causal inference is limited.
  • Abstract indicates analyses were not adjusted for confounders.

1 further detail could not be confirmed from the summary.

3secondary dataSynthesize observational evidence on whether baseline dog ownership is associated with lower cardiovascular mortality.systematic review and meta-analysisExpand

In plain English

In a systematic review and meta-analysis of observational studies, the authors report that baseline dog ownership was associated with lower cardiovascular mortality: pooled relative risk 0.69 (95% CI 0.67–0.71) with low heterogeneity (I2 = 5.1%) for the subset of studies that reported cardiovascular death.

Key findings

  • When analyses were restricted to studies evaluating cardiovascular mortality, dog ownership was associated with lower cardiovascular death (pooled relative risk 0.69; 95% CI 0.67–0.71).RR 0.69 (95% CI 0.67–0.71)
“Moreover, when we restricted the analyses to studies evaluating cardiovascular mortality, dog ownership conferred a 31% risk reduction for cardiovascular death (relative risk, 0.69; 95% CI, 0.67-0.71; I2, 5.1%).”
What this piece can’t prove
  • Analyses based on observational studies and, per the authors, were not adjusted for confounders (potential for residual confounding).
  • Abstract does not specify the number of studies contributing to the cardiovascular mortality pooled estimate.

1 further detail could not be confirmed from the summary.

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Papers considered

The selected paper, plus nearby candidates.

Crossref, PubMed, Europe PMC · 17 candidate papers

And 11 more candidates considered.