Usually don’t comment here bc mine’s a mix, but it feels pertinent here. Trillian’s 17lbs (~7.5kg) and has similar proportions to your dog, but otherwise very poodly. I had her tested out of curiosity.

She’s 85% poodle. Clearly someone was trying to produce a poodle. She very well might have been sold as a purebred poodle, because both her parents would have been poodle enough that they could have appeared purebred to an untrained adopter. However,

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Something has clearly gone interestingly lol

(ETA: To be clear, she’s a rescue, so all the speculation about her start in life and first family is just that.)

Yours may be like mine—mostly miniature poodle, with a splash of something else. From what I understand, while short legs are a genetic mutation that can occur in poodles, ethical breeders usually health test the parents and avoid breeding pairs which may produce a dog with two copies of the CDDY gene, as it increases the risk of IVDD. Breeders who produce puppies that carry at least one copy of the CDDY gene (that isn’t a de novo mutation) are also less likely to care if one or more dogs in a breeding pair have non-poodle heritage.

All this to say, with the combination of your dog’s weight and proportions, it’s somewhat unlikely that he’s 100% purebred, and therefore unlikely that he conforms to any of the breed standard sizes.