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Updated: Jun 3, 2025

Measurement of Survival Time in Brachionus Rotifers: Synchronization of Maternal Conditions

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Frailty and Mortality Risk Among Dogs with Extreme Longevity: Development and Predictive Validity of a Clinical

David J Waters^1,2, Aimee H Maras¹, Rong Fu³

¹Center for Exceptional Longevity Studies, Gerald P. Murphy Cancer Foundation, West Lafayette, IN 47906, USA.

Animals : an Open Access Journal From MDPI

|January 8, 2025

Summary

This study developed a clinical frailty index (FI) for exceptionally aging dogs, finding it predicts mortality risk. The frailty index in dogs mirrors human frailty patterns, aiding comparative aging research.

Keywords:

centenarians companion dog comparative biology deficit accumulation dog aging frailty limit gerontology healthspan longevity

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Area of Science:

Comparative biomedical science
Gerontology
Veterinary medicine

Background:

Frailty is a state of increased vulnerability due to age-related decline.
Understanding frailty in animals can inform human aging research.
The Exceptional Aging in Rottweilers Study (EARS) investigates longevity in pet dogs.

Purpose of the Study:

To develop a clinical frailty index (FI) for dogs in the EARS cohort.
To assess the ability of this FI to predict all-cause mortality in elderly dogs.
To compare frailty characteristics in dogs with those in aging human populations.

Main Methods:

A 34-item frailty index (EARS-FI) was constructed using owner-reported clinical data.
Data from 93 extremely long-lived pet dogs were analyzed.
Kaplan-Meier survival analysis and Cox proportional hazard models were used to test mortality associations.

Main Results:

The median EARS-FI was 0.43, with an estimated frailty limit of 0.68.
EARS-FI increased with chronological age (p < 0.001).
Each 0.01 unit increase in FI was associated with a 5% increase in mortality risk (HR=1.05, p=0.001).

Conclusions:

This study demonstrates a strong association between frailty and mortality risk in long-lived pet dogs.
The EARS-FI exhibits key characteristics of human frailty indices, including heterogeneity and age-related increase.
The validated EARS-FI serves as a tool for comparative aging research on deficit accumulation and mortality.