well there are MANY MANY bosses which drop pets, from all the different worlds but here are a few from memory
SPOILER
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you could fight lord nightshade and get a blue banshee a dark sprite which gives card at baby and a black cat which also gives card at baby
1%
You have to have a giftcard for it OR buy it as a treasure card but there really rare. Hope that helped xoxox - Kaitee Lyn Valdermez
As I've said before there is no exact percentage on how often iron dragons drop draconic visage's but just that it is a very rare drop.
There are 3 Way(s) you can get a Draconic Visage:-1st Way-Killing the King Black Dragon or a regular black dragon ( Rare Drop ).-2nd Way- ( Best )Killing the Mithril Dragon, ( Rare Drop ) also drops Dragon Full Helm ( V Rare Drop )-3rd Way- ( Easiest )Buying it off another player, either in the grand exchange, or on world 2.