AnAge entry for Canis familiaris

Classification (HAGRID: 02524)

Taxonomy
Kingdom: Animalia
    Phylum: Chordata
        Class: Mammalia (Taxon entry)
            Order: Carnivora
                Family: Canidae
                    Genus: Canis
Species
Canis familiaris
Common name
Domestic dog

Lifespan, ageing, and relevant traits

IMR
0.02/year
MRDT
3 years
Maximum longevity
24 years (captivity)
Source
J. Veronica Kiklevich, pers. comm.
Sample size
Large
Data quality
Acceptable
Observations

Dogs descend from the gray wolf (/Canis lupus/) and technically are not an individual species, being often classified as /Canis lupus familiaris/. Herein, they are classified as /Canis familiaris/ for practical reasons.

There is considerable variation in life history among the different dog breeds, including differences in longevity. In general, smaller breeds of dogs tend to live longer and may age slower [0423], though some have argued this might be due to artificial selection for high growth rates [0726]. Dogs are considered old after they are about 12 years old, though a few can live over 20 years [0434]. There are anecdotal reports of dogs living around 30 years, including one Australian cattle dog named "Bluey" living 29.5 years. These records are unverified and the maximum longevity of dogs is currently 24 years (J. Veronica Kiklevich, pers. comm.). A Shiba Inu mix breed male called "Pusuke" was reportedly 26.7 years of age when it died, which is unconfirmed but plausible.

Older dogs are affected by a variety of degenerative conditions and age-related diseases that are also observed in humans; larger breeds are often affected by conditions that may be related to their rapid growth, such as cancer; smaller breeds can also suffer from cancer as well as from cardiac disease. Hearing loss, cataracts and senile dementia have also been observed [0981]. Caloric restriction in Labrador Retrievers has been reported to increase median lifespan and improve physiological function [0521].

Life history traits (averages)

Female sexual maturity
510 days
Male sexual maturity
510 days
Gestation
63 days
Weaning
Litter size
6 (viviparous)
Litters per year
Inter-litter interval
Weight at birth
Weight at weaning
Adult weight
40,000 g
Postnatal growth rate
0.0244 days-1 (from Gompertz function)
Maximum longevity residual
97%

Metabolism

No information on metabolism is available.

References

External Resources

Integrated Taxonomic Information System
ITIS 183815
Animal Diversity Web
ADW account (if available)
Encyclopaedia of Life
Search EOL
NCBI Taxonomy
Entrez
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Ageing Literature
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Images
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Internet
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