All missing pets are listed here.
In order of Horror's List
UR Tiger
Unickorn
UR Rat
UR Grapes
UR Butterfly Wolf
UR Mint Horse
Sunjewel
UR Cat
July PPS
Moonswirl
UR Phoenix
UR Hollydog
UR Foal
UR Pineapple
UR Cinnabun
UR Bengal
UR Fox
UR Peas
Sunback
Non-Jewel
Non-Coon
Non-Swirl
Coontail
Grown White July
UR Lion
UR Galaxy Cat
UR Strawberry Cake
UR Pickle
Joker Bun
Light Heart Rat
Light Speckled Rat
Heavy Speckled Rat
UR Longma
UR Smore
UR Avocado
Mountain Zebra
Rainbow Mane Horse
UR Flamingo
Plains Zebra
UR Pumpkin Pie
UR Bee
UR Aussie
Blue Toxic
UR Tree
UR PPS Dragon
UR Pastel Dog