His ears,color,size are screaming pygmy/Boer cross.
Typically when anything is crossed with Nubian's they pick up the long floppy ear trait,which he doesn't have nor the nose hump.
I bred Pygmy Goats for ten years, and he does not have any real charactoristics of a pygmy goat at all. His size also suggests that he is two very large breeds; boers and nubians are both medium to large breed goats. Pygmies are, of course, miniatures, and even many crosses do not stand more than 22 inches at the wither, and he is definitely much taller than that, probably by atleast 4-6 inches, if not more. Pygmy crosses also pass on their roaning gene, very, very strongly; complete with frosted ears, nose, and tail head.
His ears are very much 'drop' style ears, and a Pygmy cross almost always has ears that 'fly away', whether there is a floppy tip or not; either that they are big and stick up. I also bred Kinder goats, so I also know those charactoristics very well as well.
Boers, Nubians and Angoras are the only goats that have a 'true' drop style ear, so either he is a combination of the two, or he is one or the other; although I lean more heavily toward Boer, because he has the body, and build of one.