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Why people said that one year of dog`s life is equivalent to seven years of life of human being?

Hi Jesica....
That's a good question, had always wondered myself. I'll try to explain in short. The dept for disease control and prevention determined in 2007 the average life expectancy of a human in America was approx 77.5 years and that of a dog on the other hand is 7-15 years so the time frame was matched to enable the same expanse of time for life expectancy between man and mans best friend.
Seven years to one human year is not necessarily correct because dogs do age at  a different rate than 7 humans years in first few years of life  then slower than 7:1 as they get older as it all depends on how much growth hormone is produced and released in first few years of life.  So for instance  a basic calculation would be first 2 years of a dogs life would equal 21 human years and each dog year after would equal 4 human years.
Different breeds have different lifespans, smaller dogs live 1.5 years longer than large breeds, desexed dogs live longer than those not desexed, females live longer than males etc but overall the 1:7 year rule isn't quite correct. I'm afraid I don't know who or how it originally came about but it has never scientifically been agreed upon but seemed to stick amongst we laymen over the years. But it does all depend on what I've mentioned above and some,
If you look at breed and the dogs weight, health, sexual status,growth, gender and apply the 21 years then 4 human years per dog year you'll be a lot closer to his/her growth and maturity age in line with humans.
I hope this has helped somewhat as it's a kind of controversial issue as never quite been totally agreed upon with differing views in scientific world. My thoughts and care for your best friend like there's no tomorrow and give him THE BEST LIFE he deserves throughout his years and health status as he'll love and protect you for his entire life and give you unconditional loyalty and that' relationship is what counts.....not how old he is. Don't you think?

Thanks for asking....all the best


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I am not a veterinarian but I do have some medical understanding and knowledge through years of experience and shelter work, but I am not prepared to give life or death medical advice and suggest if you have medical concerns you seek the advice of a QUALIFIED VET immediately for your family members' safety, health and well being. Agreed? Great! I have worked in an animal shelter,also owned dogs, cats, guinea pigs, rabbits, birds, fish, ferret, mice, oh and green tree frogs! They have all been spoiled rotten and lived to long, long old ages in pure contentment. During their lifespans I've had to manage the puppy stage of nappies and broken sleep, toddler stages, teens, maturity & elderly citizens....they are all very different with very different needs. I've dealt with various health concerns, behavioral issues, training & obedience, safe housing & lifestyle issues, exercise, toys & enrichment, safety, grooming, diet, euthanasia and so forth. I am experienced in the above and more, so would be happy to pass on my knowledge and experience if you have concerns with your "4 legged family member" I will answer your questions as quickly as possible and provide you with the best answer from my knowledge & ability. If its beyond me, I will be honest and not lead you astray, but instead direct you to someone/somewhere that can assist you further. I'm in South Australia and have good Intel on what is available and where! I appreciate that your 'baby' means the world to you,so please........ don't waste precious time online if its a medical issue or emergency of any proportion-contact your NEAREST VET STAT! I look forward to hearing from you & thanks for considering my assistance!


Young Animal Protection Society (YAPS) North Queensland (volunteer employment for 9 years) - rehab of cats and dogs all breeds, ages and backgrounds - Exercise dogs - Wash and clean kennels, cages and bedding - Prepare feed and special diets, feed all animals - train and work on behavioral issues - Monitor animals and vet needs- take when required - collect strays and follow council procedures and by laws - groom, bathe and provide allergy treatment - administer heartworm, flea, tick and worm preventatives - play and provide enrichment activities - special work with dogs with mild food/toy/dog aggression, fear, anxiety and/or mistreatment to re-establish trust and faith - Assistant Vet Nurse at Beach Road Veterinary Clinic Nth Qld Pet owner of: Pure bred German Shepherds x 2 (both males)fully obedience trained to hand signals Pure bred Australian Silky Terriers x 3 (males) Pure bred Chihuahua (male) White male ferret various goldfish, tropical and Beta's(bred Beta's) Two mice and couple of green tree frogs when younger 4 cats male - 2 male moggies, and CURRENT- 2 females ages 12 & 13, mum & daughter(PART PERSIAN Torty -assisted at birth of 4 babies, broke sacs, got breathing etc.... CURRENT: Pure bred male blue English Staffy at 5 mths Various Strays and "foster" kids over the years

Animal Welfare League WSPA Port Adelaide Dog Obedience Club

non medical Cert III & IV in animal care

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