Resting heArt and respIratory rates in dogs in their natural environment: new insights from a long-term, international, prospective study in a COhort of 703 dogs using a biometric device for LongitudinaL non-invasive cARdiorespiratory monitoring (the AI-COLLAR study).

Regarding HR ( Figure 4A ), a marked and highly significant decrease with age was observed during the first 12 months ( p < 0.0001; r = − 0.833), followed by a relative stabilization during adulthood characterized by a slight increase up to 120 months ( p < 0.0001; r = 0.084), and then another moderate increase between 120 and 220 months ( p < 0.0001; r = 0.300).

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