Both of these breeds are similar in height and weight.
Pygmy's are stockier of the two breeds. They are often raised for meat.
Nigerians are a bit more slender in the legs and are most often raised for the milk they produce.
Heights
Nigerian Dwarf Goat Doe 17" to 23"
Nigerian Dwarf Goat Buck 19" to 24"
Pygmy Goat Doe 16 " to 22"
Pygmy Goat Buck 17" to 23"
Weights
Nigerian Dwarf Goat Doe 30 to 70 lb
Nigerian Dwarf Goat Buck 40 to 80 lb
Pygmy Goat Doe 53 to 75 lb
Pygmy Goat Buck 60 to 86 lb
Blues eyes are more common among Pygmy Goats. This is a rare trait of the Nigerian Dwarf Goats.
Both breeds can be very loveable. They can be naughty as well. As with all goats, they can be escape artists.