# Sex, Sterilization and Metabolic profiles Shape Aging Trajectories and Age-related Disease Risk in Dogs

## TL;DR

This study uses dogs as a model to show how metabolism, sterilization, and body size affect aging and age-related diseases like osteoarthritis.

## Contribution

The study introduces a comprehensive aging metabolome model using dogs and identifies metabolic markers linked to age-related disease risk.

## Key findings

- Metabolites like dimethylglycine and betaine are associated with osteoarthritis risk in aging dogs.
- Sterilized dogs and large breeds show higher risk of osteoarthritis.
- No significant sex-based differences were observed in age-related disease risk.

## Abstract

The metabolome is a highly conserved network of small molecules that plays a central role in cellular metabolism and signaling, yet its role in aging remains poorly understood. Here, we leverage the companion dog as a powerful translational model to investigate age-related metabolic changes and their relationship with disease. Dogs share a similar environment with humans, exhibit age-related multimorbidity, and have shorter lifespans, making them ideal for studying aging dynamics. Using machine-learning models trained on longitudinal data from the Dog Aging Project (DAP), we constructed a comprehensive model of the aging metabolome. Our dataset included metabolomics, blood chemistry, and complete blood counts from DAP’s Precision cohort (n = 976), along with demographic, health, and lifestyle data from DAP’s Pack cohort (>50,000). We identified metabolic shifts associated with aging and age-related conditions, including osteoarthritis (OA), where metabolites such as dimethylglycine and betaine were associated with disease risk. Additionally, large, giant, and mixed breeds, as well as sterilized dogs, exhibited an increased risk of OA, whereas no significant sex-based differences were observed. These findings provide new insights into the metabolic underpinnings of age-related diseases and highlight the influence of body size and sterilization status on disease risk.