Assuming the dog is still available I won't be meeting the mom, only the dad......
That's a flag. How can the mother not be with her pup/s? The dad not being there wouldn't be unusual for quality breeders. They breed their dogs to dogs from other kennels far more often than breeding to their own stock.
If a poodle pup weighs 3lbs at 10 weeks, how big will he likely get?
Definitely not possible for the breeder to predict beyond a range and even that's tricky. My boys outgrew their parents significantly.
10w 4d
Neo 4.0lb
Remo 3.2lb
Almost 6m
10 23 17
Neo 11lb
Remo 9.5lb
Full adult weight
1 14 20
Neo 14.3lb
Remo 13lb
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Stocky is really not in the poodle breed standard.
The PCA breed standard for all varieties.
Think of the breed standard as a blueprint. There will be variances but the standard is what breeders should be trying to breed for.
IllustratedStandard.pdf (poodleclubofthelehighvalley.com)
I really recommend that you ask the breeder this specifically "Where may I see the OFA health testing?".
If they seem puzzled, or say that they don't need to, or state that they've done DNA testing, or state that the puppies tested fine, BIG FLAGS!
Puzzled = uninformed breeder
Don't need to = most likely doesn't want to spend/invest in the health of their dogs. Unlikely = old school breeder who knows their lines and those of every dog they breed with for generations back but if they haven't been breeding for decades, how could they know
DNA testing = partially informed breeder. DNA testing is nice but not the gold standard the OFA testing is.
Caveat - if the DNA test was AKC DNA testing, that is NOT health testing. That is to verify the dogs DNA identity.
Puppies tested fine = uninformed breeder, puppies are not tested, dam and sire are.
Ask for the dam and sire's registered names. There are two reasons for this. With that info you can look at the AKC registry to see if they are registered purebred poodles (possibly UKC also) and you can verify any health testing reported on OFA.
They'll also see that you are (becoming) an informed potential owner.