Who is the oldest living dog TobyKeith?

The owner of the ageing pooch have revealed the secret behind his longevity.

The four-legged friend called TobyKeith was born on January 9, 2001, making him 21-years-old.

He has outlived the normal Chihuahua's life-span, which can vary from 12 to 18 years.

The tan Chihuahua is a big brother to Luna, a seven-year-old American Bulldog and Lala, a three-year-old Chinese Crested.

TobyKeith was treated to a splash-about in a bath, had his nails trimmed, and went for a special car ride.

She believes the secret to the pet's long life is regular exercise and a nutritious diet of veggies, rice, and chicken with no sugary treats.

She said she also believes that healthy genetics and a caring environment are the keys to his "grand old age."

TobyKeith was just a few months old when Shore, an animal rescue volunteer, adopted him from a local shelter.

His original name was Peanut Butter, but was changed shortly after he joined Shore's family.