Odd as it might sound, Harbor's huge ears don't necessarily improve his hearing -- instead they boost his sense of smell. When a black and tan coonhound moves, its swinging ears push scents towards its nostrils, helping it detect and follow prey.
With his inclusion in the 2012 Guinness Book of World Records, Harbor joins a long list of dogs with very long ears.
A basset hound named Mr. Jeffries set a world record in 2002 with ears measuring about 11.5 inches, according to the BBC.
In 2003, a German basset hound named Jack took the title with ears reportedly measuring just over 13 inches.
The following year, Tigger, a bloodhound from Illinois, set a world record that still stands today, with ears measuring 13.5 inches on the left and 13.75 inches on the right -- 1.25 and .25 inches longer than Harbor's droopy ears, respectively.
Tigger, who won many dog show titles and awards, passed away in 2009, according to the Guinness website.