Running an alt through EN, and figured I’d get a chance at the pet once I did Dragons.
I’m only doing Normal diff, I know the dragons rotate, and it says Ysondre drops the pet.
Ysondre is in the rotation this week, but the Nightmare Whelpling doesn’t appear in the loot table-- for any difficulty level.
Is this some sort of weird bug? Or was it removed??
He is still there he probably just doesn’t show on the loot table just keep trying! good luck 
Just checked WoW battlepets just to make sure and there is nothing about them being removed from the raid and they average 11k to 25k on the AH
Yeah I guess it’s what they do to cover the fact that if Ysondre isn’t there, it won’t drop.
You’d think it’d be easy enough to have a flag for that, but I guess not. So instead it just doesn’t show in the loot table at all and we’re left to figure it out.
At least I bonus-rolled just in case. 
lol honestly when I got it I hadn’t realized it it was almost a week before i saw him in my bags lol
it does? i did emerald nightmare for about 10 times for balance of power quest line but i never noticed
anyway, good luck on your farm