Mark. H. suggested this Mother Goose & Grimm a partial CIDU, commenting: “Grimmy tries to encourage the dog singing the song. But the song is not about the singer – it’s about the one the singer is singing to (‘You ain’t nothin’ but a hound dog…‘). The singer might very well have caught a rabbit himself, but that wouldn’t change the song.“

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Is it really just as simple as Grimmy mistaking the subject? Should I have added this to the Sunday Funnies, instead?
Looks like we need to add an Elvis tag!
In this case, I would assume the hound dog has rewritten the lyrics to change the subject of the song, much like female singers who sing a song originally written for male voice.
“I ain’t nothin’ but a hound dog… cryin’ all the time.”
And does it mean anything that the singer is holding the guitar in a left-handed position?
@Danny Kay (2): I think he’s just holding it that way to fit the frame.
The original version of the song was a bit different, written for Big Mama Thornton by Leiber and Stoller.
You ain’t nothin’ but a hound dog
Been snoopin’ ’round my door
You ain’t nothin’ but a hound dog
Been snoopin’ ’round my door
You can wag your tail
But I ain’t gonna feed you no more
https://genius.com/Big-mama-thornton-hound-dog-lyrics
I think he’s just holding it that way to fit the frame.
This comes up in comments on strips sometimes, “Oh look, X is left-handed!” But it really was just for framing, and you can find other strips where the character is writing or whatever with the right.
The Thornton version is in Arlo territory because of the central double-entendre: “wag your tail” means exactly what you think it might…
Big Mama Thornton – Hound Dog Lyrics | Genius Lyrics
As a veteran of the folk open-mike circuit, there was always one guy who played left-handed guitar. It was especially amusing when we’d sit in a circle.
The Elvis version clears this up:
You ain’t nothin’ but a hound dog
Just cryin’ all the time
You ain’t nothin’ but a hound dog
Cryin’ all the time
Well, you ain’t never caught no rabbit
And you ain’t no friend of mine
Well, they said you was high-classed
Well, that was just a lie