Vets reveal the exact age they consider your dog OLD For many puppy owners, the thought of your dog getting old is enough to bring a tear to your eye.
In contrast, larger breeds are considered old much earlier, with some breeds classed as 'old' at age 12.1.
But a new study suggests that some breeds reach old age much quicker than others (stock image).
Jack Russell Terriers (pictured) weren't considered old until 14.1 years, while mixed breeds were 'old' at 13.2 years.
But a new study suggests that some breeds reach old age much quicker than others.
