G: Yes. I’d distinguish “upbeat” from “happy” here: a song can have relationship trouble in the lyrics and still work as a lively, fun karaoke number. I filtered primarily for tempo/energy, audience accessibility, and karaoke usefulness, rather than insisting the subject matter be cheerful. Dolly’s own career-spanning greatest-hits collection is particularly useful for separating the major songs from deep cuts. citeturn0search1turn0search5

Here are 20 I’d audition, roughly in order of how promising I think they are for what you described:

Song	Karaoke feel	Familiarity	My note
9 to 5	★★★★★	★★★★★	The obvious one—and therefore probably the one somebody else grabs. Extremely good crowd song.
Two Doors Down	★★★★★	★★★★☆	Strong candidate. Bouncy, pop-country, sing-along chorus; the hit rerecording was deliberately made more upbeat and pop-oriented. citeturn0search41
Why’d You Come in Here Lookin’ Like That	★★★★★	★★★★☆	Possibly your best backup to “9 to 5.” Fast, playful, funny and energetic. It was a #1 country hit. citeturn0search6
Here You Come Again	★★★★☆	★★★★★	Very recognizable crossover Dolly. Not frantic, but bright and buoyant despite the romantic frustration. #3 pop hit. citeturn0search0
Tennessee Homesick Blues	★★★★★	★★★☆☆	Fast, twangy, playful. Great if you want something that won't be everyone's first Dolly choice.
Baby I’m Burnin’	★★★★★	★★★☆☆	Worth hearing immediately. Late-'70s country/disco Dolly; much more energetic than people unfamiliar with her catalog might expect.
Islands in the Stream	★★★★☆	★★★★★	Huge crowd recognition, but fundamentally a duet. Excellent if you've got somebody willing to Kenny Rogers with you.
Better Get to Livin’	★★★★☆	★★☆☆☆	Later Dolly; cheerful, brisk, affirmative and very karaoke-friendly.
Heartbreak Express	★★★★☆	★★★☆☆	The title sounds depressing, but musically it's lively country-pop rather than a sit-there-and-suffer ballad.
Applejack	★★★★★	★★☆☆☆	Story-song Dolly with a romping country feel. Fun rather than polished pop.
Joshua	★★★★☆	★★★☆☆	Early #1 Dolly; energetic storytelling and a strong character song.
The Bargain Store	★★★★☆	★★★☆☆	Clever metaphor, good movement, recognizable to Dolly/country people without being painfully obvious.
All I Can Do	★★★★☆	★★☆☆☆	Short, lively mid-'70s country. Good choice if you want something distinctly Dolly rather than crossover Dolly.
Single Women	★★★★☆	★★☆☆☆	Early-'80s country-pop with a lighter, somewhat cheeky karaoke character.
Real Love	★★★★☆	★★★☆☆	Another Kenny Rogers duet, considerably less likely to get claimed than “Islands in the Stream.”
Save the Last Dance for Me	★★★★☆	★★★★☆	Dolly's version of the classic—recognizable song with a lively arrangement.
Silver Threads and Golden Needles	★★★★☆	★★★☆☆	Especially good if multiple singers are involved; Dolly/Loretta Lynn/Tammy Wynette version has plenty of country energy.
Rocky Top	★★★★★	★★★★☆	Dolly has recorded/performed it; very lively and instantly recognizable in a country crowd, though it isn't fundamentally her song.
Potential New Boyfriend	★★★★★	★★☆☆☆	This is one I'd specifically sample. Early-'80s pop-country, playful premise, much less obvious selection.
Country Is as Country Does	★★★★☆	★★☆☆☆	Later and much less famous, but energetic and fun if the karaoke library has it.

A useful confirmation that we're circling the right part of the catalog: Dolly herself has performed a medley grouping “Islands in the Stream,” “Here You Come Again,” “Why’d You Come in Here Lookin’ Like That,” and “Two Doors Down”—essentially four of the accessible crowd songs we're after. citeturn0search2 And her official greatest-hits collection includes 9 to 5, Here You Come Again, Baby I'm Burnin', Better Get to Livin', Why'd You Come in Here Lookin' Like That, Two Doors Down, Tennessee Homesick Blues, and Real Love. citeturn0search1

Where I'd start listening

Given your particular problem—you need something lively, but you also need insurance against two other people showing up with the obvious Dolly songs—I'd start with this six-song audition:

Two Doors Down → Why’d You Come in Here Lookin’ Like That → Baby I’m Burnin’ → Tennessee Homesick Blues → Potential New Boyfriend → Here You Come Again.

I suspect “Why’d You Come in Here Lookin’ Like That” may be the sweet spot. It's only about 2½ minutes, has a fast pulse, is funny/flirtatious rather than emotionally heavy, was a genuine #1 Dolly hit, and isn't one of the three songs that everybody who barely knows Dolly immediately thinks of. Contemporary reviews actually characterized it in terms of energy, “toe-tappin’” and “hand-clappin’,” which is pretty much exactly the karaoke criterion you're describing. citeturn0search6

And “Two Doors Down” is the other one I'd put a big circle around. The later hit recording actually added an upbeat sing-along bridge and a slight disco influence; it reached the pop Top 20 as well as topping the country chart. citeturn0search41 That combination screams karaoke song that people recognize once it starts even if they couldn't have named it beforehand.

Small warning: Dolly's original keys can be deceptive as hell. Some of these sound easy because she's conversational and playful while singing them, but the combination of high placement, twang and quick phrasing can be substantially harder for a male singer than the melody initially suggests. So I'd audition “Why’d You Come…” and “Two Doors Down” first for range, rather than deciding purely from how much you like the recording.