The Apache Kid is a 1930 cartoon short distributed by Columbia Pictures and features Krazy Kat.
In a tavern, Krazy is playing the piano while his spaniel girlfriend is sitting on it and singing.
Krazy finally confronts the tiger, and the two guys decide to settle things in a knife battle.
Krazy's spaniel girlfriend makes one of her earliest appearances in this short, therefore becoming one of the primary cast not originating from the comic strip.
She would then replace Ignatz Mouse as Krazy's supporting character, and even appearing in the title cards from 1930 to 1933.