Wolf armor only says "when equipped", which makes it sound like you equip it to yourself, and not a wolf.
Comments 6
Wolves can also equip armor, not just players, so I don't know how or why you think it sounds that way.
The mods usually would have changed this to "invalid" by now, so I think they think this is a valid bug.
This doesn't seem to be a bug but more of a suggestion
For helmets
"When on head"
For Chestplates
"When on body"
For Leggings
"When on legs"
And for Boots
"When on Feet"
"When equipped" is used on both Horse armour and now wolf armour, when it is equipped on a wolf, it will provide 11+ armour.