Here are the dwarven tags to make their attributes vary:
[PHYS_ATT_RANGE:STRENGTH:450:950:1150:1250:1350:1550:2250] +
[PHYS_ATT_RANGE:AGILITY:150:600:800:900:1000:1100:1500] -
[PHYS_ATT_RANGE:TOUGHNESS:450:950:1150:1250:1350:1550:2250] +
[MENT_ATT_RANGE:ANALYTICAL_ABILITY:450:950:1150:1250:1350:1550:2250] +
[MENT_ATT_RANGE:FOCUS:700:1200:1400:1500:1600:1800:2500] ++
[MENT_ATT_RANGE:CREATIVITY:450:950:1150:1250:1350:1550:2250] +
[MENT_ATT_RANGE:PATIENCE:450:950:1150:1250:1350:1550:2250] +
[MENT_ATT_RANGE:MEMORY:450:950:1150:1250:1350:1550:2250] +
[MENT_ATT_RANGE:SPATIAL_SENSE:700:1200:1400:1500:1600:1800:2500] ++
In case you want them, here are the range variations used in various creatures for good/poor attributes.
Attribute ranges:
0:100:200:300:400:450:500 ---
0:400:600:750:800:900:1100 --
150:600:800:900:1000:1100:1500 -
200:700:900:1000:1100:1300:2000
450:950:1150:1250:1350:1550:2250 +
700:1200:1400:1500:1600:1800:2500 ++
1250:1500:1750:2000:2500:3000:5000 +++
To give variant eye colours, you can select the tissue layer, and set the appearance attribute in a way similar to this:
[SET_TL_GROUP:BY_CATEGORY:ALL:SKIN]
[TL_COLOR_MODIFIER:BROWN:1:BURNT_UMBER:1:CINNAMON:1:COPPER:1:DARK_BROWN:1:DARK_PEACH:1:DARK_TAN:1:ECRU:1:PALE_BROWN:1:PALE_CHESTNUT:1:PALE_PINK:1:PEACH:1:PINK:1:RAW_UMBER:1:SEPIA:1:TAN:1:TAUPE_PALE:1:TAUPE_SANDY:1]
[TLCM_NOUN:skin:SINGULAR]
[SET_TL_GROUP:BY_CATEGORY:EYE:EYE]
[TL_COLOR_MODIFIER:IRIS_EYE_BLACK:1:IRIS_EYE_SILVER:1:IRIS_EYE_SCARLET:1:IRIS_EYE_GOLD:1:IRIS_EYE_EMERALD:1:IRIS_EYE_TURQUOISE:1:IRIS_EYE_AZURE:1:IRIS_EYE_VIOLET:1]
[TLCM_NOUN:eyes:PLURAL]
You can select different parts to give different descriptions. Here is an example I used for a skeletal creature of mine:
[SET_BP_GROUP:BY_CATEGORY:RIB_TRUE]
[BP_APPEARANCE_MODIFIER:GAPS:0:25:50:100:150:175:200]
[APP_MOD_NOUN:ribs:PLURAL]
This selects the body part by its category, applies the GAPS appearance modifier, and defines the noun used to describe the part. In this case, ribs that may be widely spaced apart, or close enough together to get tangled. Great for making the skeletal more oopy-spoopy.
As for the wiki, you may simply be looking at a page meant for an older version of the game. An exotic pet isn't typically tamed in world-gen, but may be tamed in a fortress.