What is the world’s oldest dog?
While reliable information on this question is fairly hard to come by, there have been a few reliably substantiated cases of dogs living for almost 30 years.
The oldest dog that has been somewhat reliably documented was an Australian cattle-dog named Bluey. He is reported to have lived from June 7, 1910 to November 14, 1939 (29 years, 5 months and 7 days). Bluey was owned by Les and Esma Hall of Rochester, Victoria, Australia.
In September, 2008 another dog was reported to have died at over 29 years old. Bella, a Labrador mix was owned by David Richardson of Derbyshire, England. The Guinness Book of World Records reports the oldest dog (with reliable documentation) to be Butch, a 28-year old Beagle in America who died in 2003. See the list of oldest dogs on record.
Bramble, the Labrador pictured above was reliably recorded to have lived over 27 years and died in Somerset, England in 2003. He currently has the position as the second oldest dog on record.