The two crossword solutions for the term TV Cartoon Dog are Astro and Ren. Astro is a character from the Hanna-Barbera cartoon The Jetsons, which aired from 1962 to 1987. He is a robotic dog owned by George Jetson and is known for his catchphrase 'Ruh-roh'. Ren is a character from the Nickelodeon cartoon Ren & Stimpy, which aired from 1991 to 1996. He is an emotionally unstable Chihuahua who often gets into trouble with his best friend Stimpy.