When it comes to working out how old a dog is in human years, most of us approximate by multiplying ‘dog years’ by seven. But this is deceiving. The actual age of a dog in human terms depends on breed and size. 

This is because larger breeds live shorter lives and mature more quickly. Larger and giant breeds are generally considered ‘seniors’ by the time they reach five, whilst medium sized breeds take a little longer, at approximately seven. Small and toy breeds live longer, not reaching seniority until about ten years old.

You can use this comparison chart to calculate your dog’s approximate age in human years.