Cavalier King Charles Spaniel Age Calculator
How old is your Cavalier
in human years?
Cavaliers live a little shorter than the average dog, and two large UK studies agree on that. This calculator uses the breed's own lifespan from a 2024 study of 584,734 UK dogs, including 13,782 Cavalier King Charles Spaniels.
By Claire Whitman · Updated · Sources
By Breed set to Cavalier King Charles Spaniel. Different breed? Use the main dog age calculator.
Cavalier King Charles Spaniel age chart: Cavalier years to human years
Find your Cavalier's age on the left and read across. The right column is our standard estimate for a dog under 20 lbs, the one the main calculator uses. It turns senior at 9.6, about eight months later than a Cavalier's breed-based senior age, so the Cavalier column runs a little ahead after age 2: a 10-year-old Cavalier is about 69 in human years, against 66 for a typical small dog.
| Dog age | Cavalier King Charles Spaniel | Typical small dog under 20 lbs |
|---|---|---|
| 1 year | 31 | 31 |
| 2 years | 42 | 42 |
| 3 years | 45 | 45 |
| 4 years | 49 | 48 |
| 5 years | 52 | 51 |
| 6 years | 55 | 54 |
| 7 years | 59 | 57 |
| 8 years | 62 | 60 |
| 9 years | 66 | 63 |
| 10 years | 69 | 66 |
| 11 years | 72 | 69 |
| 12 years | 76 | 72 |
| 13 years | 79 | 75 |
| 14 years | 82 | 78 |
| 15 years | 86 | 81 |
| 16 years | 89 | 84 |
Shaded cells: senior life stage (the last quarter of expected lifespan, AAHA 2019).
When is a Cavalier considered a senior?
At about 9 years old. The 2019 AAHA life stage guidelines define the senior stage as the last 25% of a dog's estimated lifespan, and 75% of the Cavalier's 11.8-year median is just under 9. Our main calculator uses 9.6 for dogs under 20 lbs, a little later.
Senior doesn't mean sick. It's the stage where vets usually move from yearly to twice-yearly checkups, and for a Cavalier those visits are a good time to have the heart listened to.
How long do Cavalier King Charles Spaniels live?
The two large UK studies land closer together for Cavaliers than for many breeds, and both put them a little below the average dog.
- 11.8 years (median): McMillan et al. (2024) combined records for 584,734 UK dogs, including 13,782 Cavaliers. Half lived past 11.8 years. The median for all dogs was 12.5.
- 10.45 years (life expectancy at birth): Teng et al. (2022) built a life table from 867 Cavaliers that died at UK vet practices. Their figure for dogs overall was 11.23.
- 12 to 15 years (breed range): the range the American Kennel Club lists. It isn't a measured average.
We use 11.8 because it has the larger sample and counts living dogs as well as those that died. We look at what's behind the numbers in Cavalier King Charles Spaniel life expectancy: why the heart matters.
The heart in aging Cavaliers
Heart murmurs were the most common problem recorded in a UK study of 1,749 Cavaliers under vet care, found in 30.9% of them. In a separate study of 111,967 dogs, Cavaliers had 47.37 times the odds of a mitral valve disease diagnosis compared with crossbreeds. A murmur is a sound, not a diagnosis on its own, so ask your vet to listen to your Cavalier's heart at every checkup.
How we calculate Cavalier age
- First two years: the formula from Wang et al. (2020, Cell Systems), human_age = 16 × ln(dog_age) + 31, the same for every dog. A 1-year-old Cavalier is about 31 in human years and a 2-year-old about 42.
- After age 2: a steady pace set so a Cavalier reaches 65 human years when it turns senior at about 9. That's about 3.3 human years per year, against 3.0 for a typical small dog. It puts a Cavalier at the 11.8-year median at about 75, the same point every size reaches at its typical lifespan in our main calculator.
Frequently asked questions
How old is a 5-year-old Cavalier in human years?
About 52. By the same method, a typical small dog would be about 51. The chart above shows every age from 1 to 16.
How old is a 10-year-old Cavalier in human years?
About 69. Ten is past the age of about 9 when a Cavalier enters the senior stage.
When is a Cavalier King Charles Spaniel considered a senior?
From about 9 years. AAHA treats the last 25% of a dog's expected lifespan as the senior stage, and the median lifespan for Cavaliers is 11.8 years.
How long do Cavalier King Charles Spaniels live?
A 2024 study of 584,734 UK dogs found a median of 11.8 years. A UK life table estimated 10.45 years of life expectancy at birth, and the American Kennel Club lists 12 to 15 years.
Do all Cavaliers get heart problems?
Not all, but heart trouble is the breed's most common recorded problem. In a UK study of Cavaliers under vet care, 30.9% had a heart murmur recorded, and another study found Cavaliers had 47.37 times the odds of a mitral valve disease diagnosis compared with crossbreeds.
Sources
- McMillan KM, Bielby J, Williams CL, Upjohn MM, Casey RA, Christley RM (2024). Longevity of companion dog breeds: those at risk from early death. Scientific Reports 14: 531. doi:10.1038/s41598-023-50458-w
- Teng KT, Brodbelt DC, Pegram C, Church DB, O'Neill DG (2022). Life tables of annual life expectancy and mortality for companion dogs in the United Kingdom. Scientific Reports 12: 6415. doi:10.1038/s41598-022-10341-6
- Summers JF, O'Neill DG, Church DB, Thomson PC, McGreevy PD, Brodbelt DC (2015). Prevalence of disorders recorded in Cavalier King Charles Spaniels attending primary-care veterinary practices in England. Canine Genetics and Epidemiology 2: 4. doi:10.1186/s40575-015-0016-7
- Mattin MJ, Boswood A, Church DB, López-Alvarez J, McGreevy PD, O'Neill DG, Thomson PC, Brodbelt DC (2015). Prevalence of and risk factors for degenerative mitral valve disease in dogs attending primary-care veterinary practices in England. Journal of Veterinary Internal Medicine 29(3): 847–854. doi:10.1111/jvim.12591
- Wang T, et al. (2020). Quantitative translation of dog-to-human aging by conserved remodeling of the DNA methylome. Cell Systems 11(2): 176–185. doi:10.1016/j.cels.2020.06.006
- Creevy KE, et al. (2019). 2019 AAHA Canine Life Stage Guidelines. Journal of the American Animal Hospital Association 55(6): 267–290. doi:10.5326/JAAHA-MS-6999
- American Kennel Club. Cavalier King Charles Spaniel breed profile.