[DallasBiff]

Of course the classic Lassie is going to be #1, June Lockhart is almost 100.

As for Scooby-Doo, he was not a pet, but part of the gang.

Although Scooby's voice was a direct ripoff of Astro from the Jetson's.

[Doctor Congo]

Bandit, from Johnny Quest

[ansel12]

White Fang.

Soupy Sales, White Fang: Don’t eat sweets!
https://www.youtube.com/watch?v=C1G9c2PXK70

[Right Brother]

Columbo’s Basset Hound ‘Dog’.

[9YearLurker]

To me, Arnold is #1 and Mr. Ed is #2.

Generically cute dogs don’t really count.

[mware]

Lassie, Rin Tin Tin,Flicka,Fury,Flipper,Skippy the Bush Kangaroo,

[M Kehoe]

Rin Tin Tin.

5.56mm

[Billthedrill]

Mr. Peabody’s pet boy Sherman.

[Clutch Martin]

No Trigger?

[equaviator]

The original George of the Jungle's pet elephant named Smedley

[Laslo Fripp]

Barbara Eden in “I Dream of Jeannie”.

[Afterguard]

Rocks. No fur to vacuum, no food necessary, and never any poo to clean up. (This was too easy!)

[Nea Wood]

Another dog named simply “Dog” was the one on Petticoat Junction, who I believe also played “Benjie” in the movies. His real name was Higgins but he was just “Dog” on Petticoat Junction.

I always thought the cutest dog on TV was Murray on Mad About You.

[Clay Moore]

Flash from Dukes of Hazzard.

[waterhill]

Flash, Roscoe’s dog on The Dukes of Hazzard.

[dragnet2]

[T.B. Yoits]

“Thing” from “The Addams Family”.

[Polyxene]

Pappy Boyington’s Bull Terrier, Meatball, on Black Sheep Squadron. Reminded me of Willie, Patton’s dog.

[Chode]

[left that other site]

Arnold Ziffel

[mewzilla]

Rhubarb.

Thomasina.

Pyewacket.

Baby.