Old Blue Eyes Frank Sinatra often used 'fella' as his signature way of addressing people.
Screen Details
Good Fella' - reference to the classic movie Goodfellas (1990). Also commonly used in old Western films as a friendly term of address.
Personality Plus
Casual, easy-going, and approachable - perfect for a laid-back pet who's everyone's buddy. Suggests a friendly masculine character with a confident swagger.