Foghorn Leghorn was directly inspired by the character of Senator Claghorn, a blustery Southern politician played by Kenny Delmar on Fred Allen's popular 1940s radio show. Foghorn adopted many of Claghorn's catchphrases, such as "I say..." and "That's a joke, son!" Delmar's inspiration for Claghorn was a Texas rancher who was fond of saying this.

According to Keith Scott, the character's voice was also patterned after a hard-of-hearing West Coast-only radio character from the 1930s, known simply as The Sheriff, on a radio program called Blue Monday Jamboree. The accent has similarities to that of another Mel Blanc voice: Yosemite Sam (a near-strictly Friz Freleng character); and even more similar to a proto-Sam character in Stage Door Cartoon.

Physically, Foghorn Leghorn is depicted as a very large rooster with a Southern accent; he is easily the tallest of all the regular Looney Tunes characters. He has a bombastic and somewhat unrefined personality, and shows a penchant for mischief. Aside from the Senator Claghorn reference, "Foghorn" is indicative of his loudmouthed personality, while "Leghorn" refers to a particular Italian breed of chicken. According to A Broken Leghorn and Raw! Raw! Rooster! Foghorn lives on "Old MacDonald's Farm" in Cucamonga, California, and had attended Chicken Tech University; his college roommate and rival Rhode Island Red is a practical joker and even more obnoxious than Foghorn himself.

Foghorn often fancies himself a mentor figure to the smaller and younger characters he encounters, particularly Henery Hawk, tossing off bits of self-styled sagacity interjected with phrases like "Pay attention, son", or "Look at me when I'm talkin' to ya, boy", both of which are borrowed heavily from Senator Claghorn's vernacular. But this proves to be Foghorn's worst trait, as his loud and fast mouth and propensity for over-explanation eventually annoys his intended subjects so much that, completely fed up with him, they end up hitting him over the head with a blunt object, yelling "Ahhhhh, shut up!" and leaving in a huff.
Beginning with the 1949 cartoon Henhouse Henery, Foghorn frequently performs a verse from the Stephen Foster song "Camptown Races", softly humming the lyrics while loudly singing the refrain "Doo-Dahh! Doo-Dahh!", and ending the verse, again loudly, with "Ohh, Doo-Dahh Day!" He often hums the song more than once in a given short, though in the 1950 cartoon The Leghorn Blows at Midnight, he hums "Camptown" only at the beginning, but then hums "Old MacDonald" in two later scenes. On occasion, he also sings his own lyrics if they are related to what he's doing at the time. "Camptown Races" essentially became Foghorn's signature tune and one of the most widely familiar uses of the song in popular culture. The final theatrical film in which Foghorn sings "Camptown" is Mother Was a Rooster (1962).
Many of Foghorn's cartoons involve his perennial prank war with Barnyard Dawg, though it is never revealed how or why their feud started in the first place. Foghorn is often the initial aggressor, but unlike most of the other Looney Tunes rivalries, Foghorn pranks Dawg out of sheer self-amusement and Dawg is usually the one with the winning hand in nearly every short they appear together, although both lost in Walky Talky Hawky, Of Rice and Hen, and Mother Was a Rooster, and Foghorn managed to have some victories over Dawg in the Looney Tunes comic books. But for all of Foghorn's pranks, Dawg is just as adept at retaliation.

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Shorts (1946–1964)

All of the 29 shorts from 1946 to 1964 were directed by Robert McKimson
199 Walky Talky Hawky (1946)
299 Crowing Pains (1947) – with Sylvester
399 The Foghorn Leghorn (1948)
499 Henhouse Henery (1949)
599 The Leghorn Blows at Midnight (1950)
699 A Fractured Leghorn (1950)
799 Leghorn Swoggled (1951)
899 Lovelorn Leghorn (1951)
999 Sock-a-Doodle-Do (1952)
1099 The EGGcited Rooster (1952)
1199 Plop Goes the Weasel (1953)
1299 Of Rice and Hen (1953)
1399 Little Boy Boo (1954)
1499 Feather Dusted (1955)
1599 All Fowled Up (1955)
1699 Weasel Stop (1956)
1799 The High and the Flighty (1956) – with Daffy Duck
1899 Raw! Raw! Rooster! (1956)
1999 Fox-Terror (1957)
2099 Feather Bluster (1958)
2199 Weasel While You Work (1958)
2299 A Broken Leghorn (1959)
2399 Crockett-Doodle-Do (1960)
2499 The Dixie Fryer (1960)
2599 Strangled Eggs (1961)
2699 The Slick Chick (1962)
2799 Mother Was a Rooster (1962)
2899 Banty Raids (1963)
2999 False Hare (1964) (cameo) – with Bugs Bunny
Miscellaneous
199 Daffy Duck and Porky Pig Meet the Groovie Goolies (1972) - voiced by Mel Blanc
299 Bugs Bunny's Christmas Carol (1979) - voiced by Mel Blanc
399 The Yolk's on You (1980) voiced by Mel Blanc
499 Who Framed Roger Rabbit (1988) – voiced by Mel Blanc, (silent cameo appearance; voiced in a deleted scene)

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