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How to Tell How Old Your Dog Is (Human & Dog Years) Download Article Gauging your dog's age by their physical and behavioral traits Co-authored by Lauren Baker, DVM, PhD and Luke Smith, MFA
Last Updated: June 9, 2024 References
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Physical Signs
|
Behavior
|
Finding Your Dog's Age in Human Years
|
Seeking Help from a Vet
|Show more|Show less X
This article was co-authored by Lauren Baker, DVM, PhD and by wikiHow staff writer, Luke Smith, MFA. Dr. Lauren Baker is a Veterinarian and Assistant Scientist at the University of Wisconsin-Madison. With over 10 years in veterinary medicine, she specializes in the concept of “one health,” which uses insights from veterinary medicine to help human medical research. She holds a Ph.D. in Comparative Biomedical Sciences, a Doctor of Veterinary Medicine, an MS in Comparative Biomedical Sciences, and a Bachelor’s degree in Psychology from the University of Wisconsin-Madison. There are 10 references cited in this article, which can be found at the bottom of the page. This article has been viewed 142,818 times.
If you adopted or rescued your dog, you might not know your furry friend’s age. In addition to satisfying your curiosity, determining your dog's age tells you what to feed them, how much exercise they need, and other vital information for how to make their life as comfortable as possible. We’ll tell you all about how to evaluate your dog’s age based on physical and behavioral characteristics, as well as how to convert dog years to human years, and when to see a vet for a more accurate opinion.
Things You Should Know
Check your dog’s teeth. If there are slight ridges on their front teeth, your pup is still relatively young. Smooth and yellowing teeth indicate an older dog.
Look at your dog’s eyes. Young dogs have clear, black irises. Older dogs develop cloudy, gray or bluish discs in the center of their eyes as they age.
Examine your dog’s fur. Often, older dogs have more gray or white fur around their snout, ears, legs, and paws than their younger counterparts.
Steps
Section 1 of 4:
Physical Signs
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1 Teeth It’s often easiest to tell your dog’s age by their teeth. Gently lift up their lips to examine their chompers. Puppies have small, emerging teeth at 3 weeks old, and have all their sharp baby teeth at 6 weeks. At 12 weeks, their baby teeth begin to fall out, and their adult teeth (canines and incisors) emerge. By the time they’re 6 months old, they have all their full-sized, adult teeth, with flat molars in the back.[1]XResearch source
Young dogs often have ridges or bumps on their front teeth, which help with chewing. The ridges are faint at around 3-4 years old, and your dog’s teeth are totally smooth at 7 years old.[2]XResearch source
Dogs older than 4 develop tartar buildup or yellowing on their teeth, which gets thicker and darker the older your dog is.
2 Eyes Young dogs often have clear, unclouded eyes. Middle-aged to elderly dogs, on the other hand, tend to develop round, gray or bluish clouds in the center of their eyes. This is known as lenticular sclerosis, and happens when the lenses of your dog’s eyes harden with age. It doesn’t affect how well your dog sees, but is a good indicator that they’re at least around the middle of their breed’s lifespan.[3]XResearch source
Note that lenticular sclerosis is different from cataracts, which are white and opaque, and do affect vision. Cataracts are also common in older dogs, but if you notice them, consult a veterinarian about care.
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3 Fur Fur color often changes as a dog ages, but isn’t the most reliable indicator of age. Generally, younger dogs have less gray or white fur, while older or elderly dogs have much more, especially around the snout. That said, gray fur can develop around the snout as early as 2 years into a dog’s life, and many dogs gray prematurely as a result of high activity, stress, or even just genetics.[4]XResearch source It’s best to consider fur alongside other indicators, like your dog’s teeth, eyes, and behavior.
If you notice graying in multiple places on your dog, such as the legs, paws, and ears, it’s more likely that your dog is nearing its senior years.
4 Paws Puppies and younger dogs often have softer paw pads on the bottoms of their feet. In middle-aged to senior dogs, these pads are often much darker, dryer, and even cracked as a result of years of wear. Older dogs also often have dryer, more brittle nails, which may flake.[5]X Trustworthy Source American Kennel ClubThe American Kennel Club (AKC) is a purebred dog pedigree registry in the United States. The AKC advocates for the responsible ownership of dogs and promotes purebred dog events, such as the Westminster Dog Show. Go to source
5 Muscle tone & build Of course, puppies are smaller and leaner than adults of their breed. Adults are in their prime, and, if they’re healthy and active, are sturdy and fairly muscular. As dogs age and become seniors, their backs tend to sag, their bones may become more visible, and their spine becomes more prominent. Also, around middle age, dogs may develop pads of fat on their lower back or hip area.[6]X Trustworthy Source American Kennel ClubThe American Kennel Club (AKC) is a purebred dog pedigree registry in the United States. The AKC advocates for the responsible ownership of dogs and promotes purebred dog events, such as the Westminster Dog Show. Go to source
Musculature is often a less reliable indicator of age (other than dramatic signs like a sagged back), since each breed, and even individual dog, has a different build.
6 Breed and size While the above characteristics can help you gauge your dog’s age, lifespans vary by breed and size, which makes it difficult to say exactly how old a dog is. You can get a better idea, though, by looking up the typical characteristics of your dog’s breed on a site like American Kennel Club, and comparing those characteristics to those of your dog.[7]X Trustworthy Source American Kennel ClubThe American Kennel Club (AKC) is a purebred dog pedigree registry in the United States. The AKC advocates for the responsible ownership of dogs and promotes purebred dog events, such as the Westminster Dog Show. Go to source
Most dogs are considered puppies until they’re 2 years old. From ages 2-9, they’re middle-aged, mature adults. From about 10 and onward, they’re considered seniors.[8]X Trustworthy Source PubMed CentralJournal archive from the U.S. National Institutes of Health Go to source
Small dogs like Chihuahuas (<20 lb (9.1 kg)) enter old age at around 12 years.
Giant dogs like Great Danes(>90 lb (41 kg)) enter old age around 8-9 years.
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Behavior
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1 Energy levels It goes without saying that puppies have loads of energy (which you can also use to tell a puppy’s age). They’re active, playing, and chewing on everything until about 1.5 years of age.[9]XResearch source Then, around middle age, your dog’s energy levels subside and even out, becoming more consistent. In old age, your dog may slow down significantly, preferring a snooze over play time.[10]X Trustworthy Source American Kennel ClubThe American Kennel Club (AKC) is a purebred dog pedigree registry in the United States. The AKC advocates for the responsible ownership of dogs and promotes purebred dog events, such as the Westminster Dog Show. Go to source
On top of lower energy levels, older or senior dogs generally have a harder time getting around; you may need to help them up the stairs from time to time. This may be caused by arthritis, stiffness, or general fatigue.
2 Hearing Most dogs tend to lose some or all of their hearing as they advance into their senior years. It often begins as a loss of middle- to high-pitched sounds. It’s a totally natural part of your dog’s lifespan, but many people confuse it for behavioral problems.[11]XResearch source Try saying your dog’s name at a normal volume in the same room as your dog. If their ears perk up, they’ve heard you. If not, they may have hearing loss (or be dozing), and are further along on their path of life.
3 Mental activity Puppies tend to be sharp, curious, and quick to pick up new commands. Middle-aged dogs are more confident and comfortable in their surroundings. Senior dogs may experience some mental decline as they advance in their years. This might include anxiety around familiar people or objects, increased vocalizations, general disorientation or clumsiness, or a change in their sleeping cycles.[12]X Trustworthy Source American Kennel ClubThe American Kennel Club (AKC) is a purebred dog pedigree registry in the United States. The AKC advocates for the responsible ownership of dogs and promotes purebred dog events, such as the Westminster Dog Show. Go to source
All of these are natural parts or your dog’s lifespan, but if you’re worried about your dog’s behavior, consult a vet to help you manage a senior dog’s behavioral needs.
4 Age-related ailments Older dogs tend to experience a range of diseases or other ailments associated with advanced age. They may develop lumps under their skin (called lipomas, which aren’t cause for alarm). They might also be prone to incontinence, constipation, or accidents in the house as their bowels deteriorate.[13]XResearch source Other age-related conditions include heart or liver disease, diabetes, and obesity.[14]XResearch source
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Finding Your Dog's Age in Human Years
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1 Add 15 years for the first year, and 9 for the second year. While conventional wisdom says to multiply a dog's age by 7 to determine human years, developmentally speaking, dogs are well over 7 years old (in human years) by the time they’re 1. In fact, most breeds of dogs are about 15 years old in human years by that time. Likewise, in their second year of life, they develop another 9 human years. Regardless of breed and size, most dogs are approximately 24 human years by the time they're 2 years old.[15]X Trustworthy Source American Kennel ClubThe American Kennel Club (AKC) is a purebred dog pedigree registry in the United States. The AKC advocates for the responsible ownership of dogs and promotes purebred dog events, such as the Westminster Dog Show. Go to source
2 Add 5 years for each subsequent year. After those first 2 years of growing, add about 5 years to a dog's age for every subsequent year for a more accurate gauge. By 3 years old, most dogs will be 28 in human years. By 4, most dogs will be 32 in human years, and so on.[16]X Trustworthy Source American Kennel ClubThe American Kennel Club (AKC) is a purebred dog pedigree registry in the United States. The AKC advocates for the responsible ownership of dogs and promotes purebred dog events, such as the Westminster Dog Show. Go to source
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Seeking Help from a Vet
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1 Have your vet examine your dog for signs of aging. If you're unsure of your dog's age, have your vet conduct an examination. Your vet will be more familiar with the characteristics of your dog’s breed and will be able to check your dog’s teeth, fur, eyes, and so on to produce a more accurate guess of their age than you might at home. Your vet will also be able to spot any signs of age-related disease or other ailments and help you manage them as they appear.[17]XResearch source
2 Get a blood panel done. If you're very unsure of your dog's age, a blood panel may provide some insight. A vet can take a blood panel to determine the functions of organs like the kidneys and liver. A dog's organs will function differently at different ages.[18]XResearch source However, while this can give you a rough sense of your dog's age, your vet may only be able to determine an approximate age range. The only way to know your dog's age for sure is to know their birthday.
If you don't know much about your dog's history, then you might want to take them to see a veterinarian and have bloodwork done anyway. A blood panel is a good, general indicator of your dog's health, and it can also identify problems before they become serious illnesses.
3 Talk to your vet about keeping your dog healthy as they age. If your dog is older or middle-aged, talk to your vet about ways to keep your dog healthy and happy. The risk for age-related diseases and ailments rises as a dog gets older, but your vet is able to provide a wealth of tips and recommendations for helping you give your dog the best quality of life.[19]XResearch source
For example, your vet may recommend brushing your dog's teeth, as teeth decay with age.
Your vet may also recommend that you keep your dog active to control its weight. Daily walks are a great way to keep your dog happy as they age.
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Keep in mind that it’s impossible to tell a dog’s exact age, unless you know the date they were born, the same way you can’t tell a person’s precise age just by looking at them.
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Co-authored by: Lauren Baker, DVM, PhD Veterinarian This article was co-authored by Lauren Baker, DVM, PhD and by wikiHow staff writer, Luke Smith, MFA. Dr. Lauren Baker is a Veterinarian and Assistant Scientist at the University of Wisconsin-Madison. With over 10 years in veterinary medicine, she specializes in the concept of “one health,” which uses insights from veterinary medicine to help human medical research. She holds a Ph.D. in Comparative Biomedical Sciences, a Doctor of Veterinary Medicine, an MS in Comparative Biomedical Sciences, and a Bachelor’s degree in Psychology from the University of Wisconsin-Madison. This article has been viewed 142,818 times. 22 votes - 92% Co-authors: 7Updated: June 9, 2024 Views: 142,818 Categories: Canine HealthArticle SummaryX
To determine your puppy's age, check to see if its teeth are just pushing through the gums, which happens at around 1 month. If your puppy has a full set of baby teeth, it's probably around 2 months old. If you see adult canines and incisors starting to come in, your dog is 4 months old. However, if your puppy has a full set of adult teeth, it's probably closer to 7 months old. For older dogs, look for changes like worn ridges off their bottom incisors, which happens by the time they’re 3, or off their upper incisors, which happens by the time they’re 5. To learn from our Veterinary reviewer how to determine your dog's age from its eyes and fur, read on!Did this summary help you?YesNo
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Donna Butler
Nov 22, 2022
"I was not aware of the dog's aging process. My dog just passed and according to your chart she was actually 72 years old. Thanks for the information."..." more
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Yes No Advertisement Cookies make wikiHow better. By continuing to use our site, you agree to our cookie policy. Co-authored by: Lauren Baker, DVM, PhD Veterinarian Co-authors: 7Updated: June 9, 2024 Views: 142,81892% of readers found this article helpful. 22 votes - 92% Click a star to add your vote
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Download Article Gauging your dog's age by their physical and behavioral traits Co-authored by Lauren Baker, DVM, PhD and Luke Smith, MFA 
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Co-authored by: Lauren Baker, DVM, PhD Veterinarian This article was co-authored by Lauren Baker, DVM, PhD and by wikiHow staff writer, Luke Smith, MFA. Dr. Lauren Baker is a Veterinarian and Assistant Scientist at the University of Wisconsin-Madison. With over 10 years in veterinary medicine, she specializes in the concept of “one health,” which uses insights from veterinary medicine to help human medical research. She holds a Ph.D. in Comparative Biomedical Sciences, a Doctor of Veterinary Medicine, an MS in Comparative Biomedical Sciences, and a Bachelor’s degree in Psychology from the University of Wisconsin-Madison. This article has been viewed 142,818 times. 22 votes - 92% Co-authors: 7 Updated: June 9, 2024 Views: 142,818 Categories: Canine Health Article SummaryX
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1 Teeth It’s often easiest to tell your dog’s age by their teeth. Gently lift up their lips to examine their chompers. Puppies have small, emerging teeth at 3 weeks old, and have all their sharp baby teeth at 6 weeks. At 12 weeks, their baby teeth begin to fall out, and their adult teeth (canines and incisors) emerge. By the time they’re 6 months old, they have all their full-sized, adult teeth, with flat molars in the back.[1] 
2 Eyes Young dogs often have clear, unclouded eyes. Middle-aged to elderly dogs, on the other hand, tend to develop round, gray or bluish clouds in the center of their eyes. This is known as lenticular sclerosis, and happens when the lenses of your dog’s eyes harden with age. It doesn’t affect how well your dog sees, but is a good indicator that they’re at least around the middle of their breed’s lifespan.[3] 
3 Fur Fur color often changes as a dog ages, but isn’t the most reliable indicator of age. Generally, younger dogs have less gray or white fur, while older or elderly dogs have much more, especially around the snout. That said, gray fur can develop around the snout as early as 2 years into a dog’s life, and many dogs gray prematurely as a result of high activity, stress, or even just genetics.[4] It’s best to consider fur alongside other indicators, like your dog’s teeth, eyes, and behavior. 
4 Paws Puppies and younger dogs often have softer paw pads on the bottoms of their feet. In middle-aged to senior dogs, these pads are often much darker, dryer, and even cracked as a result of years of wear. Older dogs also often have dryer, more brittle nails, which may flake.[5] 
5 Muscle tone & build Of course, puppies are smaller and leaner than adults of their breed. Adults are in their prime, and, if they’re healthy and active, are sturdy and fairly muscular. As dogs age and become seniors, their backs tend to sag, their bones may become more visible, and their spine becomes more prominent. Also, around middle age, dogs may develop pads of fat on their lower back or hip area.[6] 
6 Breed and size While the above characteristics can help you gauge your dog’s age, lifespans vary by breed and size, which makes it difficult to say exactly how old a dog is. You can get a better idea, though, by looking up the typical characteristics of your dog’s breed on a site like American Kennel Club, and comparing those characteristics to those of your dog.[7] 
1 Energy levels It goes without saying that puppies have loads of energy (which you can also use to tell a puppy’s age). They’re active, playing, and chewing on everything until about 1.5 years of age.[9] Then, around middle age, your dog’s energy levels subside and even out, becoming more consistent. In old age, your dog may slow down significantly, preferring a snooze over play time.[10] 
2 Hearing Most dogs tend to lose some or all of their hearing as they advance into their senior years. It often begins as a loss of middle- to high-pitched sounds. It’s a totally natural part of your dog’s lifespan, but many people confuse it for behavioral problems.[11] Try saying your dog’s name at a normal volume in the same room as your dog. If their ears perk up, they’ve heard you. If not, they may have hearing loss (or be dozing), and are further along on their path of life. 
3 Mental activity Puppies tend to be sharp, curious, and quick to pick up new commands. Middle-aged dogs are more confident and comfortable in their surroundings. Senior dogs may experience some mental decline as they advance in their years. This might include anxiety around familiar people or objects, increased vocalizations, general disorientation or clumsiness, or a change in their sleeping cycles.[12] 
4 Age-related ailments Older dogs tend to experience a range of diseases or other ailments associated with advanced age. They may develop lumps under their skin (called lipomas, which aren’t cause for alarm). They might also be prone to incontinence, constipation, or accidents in the house as their bowels deteriorate.[13] Other age-related conditions include heart or liver disease, diabetes, and obesity.[14] Advertisement 
1 Add 15 years for the first year, and 9 for the second year. While conventional wisdom says to multiply a dog's age by 7 to determine human years, developmentally speaking, dogs are well over 7 years old (in human years) by the time they’re 1. In fact, most breeds of dogs are about 15 years old in human years by that time. Likewise, in their second year of life, they develop another 9 human years. Regardless of breed and size, most dogs are approximately 24 human years by the time they're 2 years old.[15] 
2 Add 5 years for each subsequent year. After those first 2 years of growing, add about 5 years to a dog's age for every subsequent year for a more accurate gauge. By 3 years old, most dogs will be 28 in human years. By 4, most dogs will be 32 in human years, and so on.[16] Advertisement 
1 Have your vet examine your dog for signs of aging. If you're unsure of your dog's age, have your vet conduct an examination. Your vet will be more familiar with the characteristics of your dog’s breed and will be able to check your dog’s teeth, fur, eyes, and so on to produce a more accurate guess of their age than you might at home. Your vet will also be able to spot any signs of age-related disease or other ailments and help you manage them as they appear.[17] 
2 Get a blood panel done. If you're very unsure of your dog's age, a blood panel may provide some insight. A vet can take a blood panel to determine the functions of organs like the kidneys and liver. A dog's organs will function differently at different ages.[18] However, while this can give you a rough sense of your dog's age, your vet may only be able to determine an approximate age range. The only way to know your dog's age for sure is to know their birthday. 
3 Talk to your vet about keeping your dog healthy as they age. If your dog is older or middle-aged, talk to your vet about ways to keep your dog healthy and happy. The risk for age-related diseases and ailments rises as a dog gets older, but your vet is able to provide a wealth of tips and recommendations for helping you give your dog the best quality of life.[19] 
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