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On this page, you will find the extra properties a mob can be given as an NPC, such as its variant, its age or its collar colour.
Which properties appear depends entirely on the mob the NPC is set to. A cat has a variant, a wolf has a variant and a collar colour, a slime has neither and says so instead of opening a list. Changing the Entity Type resets whatever was chosen here, since the values of one mob mean nothing to another.
#Variant
With this option, you can pick which kind of the mob the NPC is: the colour of a sheep or a llama, the breed of a cat, a rabbit or a fox, the biome coat of a cow, a pig or a chicken, the profession skin of a villager. The list is read from the server itself, so a variant added by a newer Minecraft version shows up without an update here.
Entity Properties (Variant)
#Age
With this option, you can make the NPC a baby instead of an adult. It appears for every mob that can be a baby at all, on top of whatever other properties that mob has.
Entity Properties (Age)
#Collar
With this option, you can set the collar colour of a wolf. It is the one property that is not a variant, so a wolf shows it next to its own variant list.