Substance wise, to me, he looks more Pygmy, there is no arguing that; his bones are as large as the does, even though he is only 6 months of age. He's got promise for width of body...look at how wide he is across his shoulders. He does not look like a dairy goat to me...even if he isn't as wide as that doe. Let's not forget that he is 6 months; he has a lot of growing to do, especially if he is Pygmy...I have had Pygmies grow and fill out until their 2-3rd years. They may not grow height wise, beyond their yearling year, but width, and depth and muscle wise, they tend to 'bloom' much later.
As far as those stating that he is 'longer' than most Pygmies...take a look at the NPGA standard, and you will find that they are to be slightly longer in body than they are tall (in height), at maturity.
For this particular kid, I see alot more height, than length, however, he could even out as he ages. Nigerian Dwarf goats are also, supposed to be shorter (by breed standard) than Pygmies, so that he is almost as tall as that doe, really means nothing at this point, imo. We don't know the height of that doe either...she could be as little as 17 inches at the shoulder; so he could easily grow to 23 inches, and still be under the breed standard for height.