What could be causing a young dog to limp that isn't hip dysplasia?

That's a tough one, did the veterinarian mention arthritis as a possibility? Goldendoodle would be in the high risk category of developing arthritis and it can happen at a very early age. I have no idea what I am talking about but my old lab did something similar in her later years and a joint supplement seemed to help her. Maybe something to look into.

Try and get a message to ColoradoAg, he is a veterinarian.

Not overweight. Regardless, might start her on some joint supplements. Any specific ones that y'all recommend?

Cosequin I highly recommend it

I hate to say it, but it sounds like an ACL to me. I'd take the pup back to the vet and have them check again.

We have a miniature poodle and she had something similar. The vet said the patella tendon can slip out of the groove and is common for the breed. They suggested a surgery that basically deepens the groove and has something like a guardrail attached to the bone to keep from happening. We have not done it and she has been fine. She will limp from time to time when starting a jog but does not seem to bother her.

Don’t laugh but have checked her toe nails?

Pulled muscle

I had a walker pup years back that had a bad limp develop at about 8 months old. Turned out to be a goofy ball and socket structure that had some bone fragments floating around in the cartridge. Dont remember what the vet called it but there's a term for it I cant recall. Got significantly better with a diet of raw chicken necks but never fully went away.

When mine blew her knee she kept jumping up on things even with the pain and damage. Dogs can take a lot of pain. If it is the knee warring they can damage the other knee trying to protect the bad one. Ask me how I know, yep mine blew out both. Fixed one then the other knee. Was not cheap.
Don’t let her jump if can help especially into the truck. Dogs often can get injured jumping out of high things like trucks also.

If want to see one of the best specialists I used Dr. John Mauterer he has offices in New Orleans and in Baton Rouge. Cost for consultation will be about same as your Vet but surgery if blown knee will be $3500–$4000
Good luck hope it’s just a small healable injury

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I'll get her ACL checked out

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ACL (or more accurately in a dog, CCL) tear is VERY common and would present as you describe. Definitive diagnosis is by anterior drawer sign, but in a partial tear that may not be apparent.
Regardless of what it is, strict exercise restriction is advised, meaning limited to brief leash relief walks until you get a diagnosis and/or the dog is healed up.

Like in humans, a CCL tear will never heal itself, although the body can and will begin to compensate. It will lead to arthritis, and there's a good chance if one is torn, the other will blow out also some point in the future.

Hopefully she just tweaked something, with no long standing effects. You may want to consider pet health insurance if your vet has documented this as NOT a real injury (nothing torn, broken, no HD or patellar luxation, etc) ... CCL surgery is $$$$ and honestly the reason I recently signed up for insurance for my rough and tumble girl.