Old Reliable is a bloodhound mentioned in Lady and the Tramp. He is the grandfather of Trusty.
Since he is only mentioned, his appearance is unknown.
Old Reliable's personality is unknown, although his name may suggest that he is very reliable.
Trusty was telling Jock and Lady how he and Old Reliable used to track criminals down in the swamps of Louisiana. Throughout the film, Trusty keeps saying "As my grandpappy, Ol' Reliable used to say, uh, don't recollect that I've ever mentioned Old Reliable before."
- Old Reliable is the only known grandfather in either film.
- Old Reliable is one of only a few characters to be mentioned.
- Despite being mentioned frequently in Lady and the Tramp, he is not mentioned in Lady and the Tramp 2: Scamp's Adventure.
- Old Reliable is one of only a few characters to be known family of the characters in either film.