See Magenta Seal and Galactic Firefly.
Please see Small Pets and Big Pets on their respective pages. The images listed on this Wiki provide (arguably) an example of the minimum worth combination for each pet, and the listed value provides the minimum or starting value for each pet. The value of a Pet is dependent on features and Jammer preference. It is possible for certain Small Pets to be worth more in value than Big Pets due to features and Jammer preference.
Small Pets
"Small" Rare Promo Pets are described as "Small" in relation to their value, they are normally worth less than "Big" Rare Promo Pets, more common and more easily obtainable.
Small Pets include: Pet Golden Bunny, Non-Member Pet Phantom, Pet Squirrel, Pet Mouse, Pet Firefly, Pet Grasshopper, Pet Ladybug, Pet Mantis, Rare Member Pet Phantom, Meagyn's Pet Bear, Pet Puppy with Effects, Pet Snake with Effects, Pet Duck with Effects, and Pet Turtle.
Big Pets
"Big" or "Ultra" Rare Promo Pets are described as such in relation to their value. They are normally worth more than "Small" Rare Promo Pets since they are more uncommon and difficult to obtain. Most Big Promo Pets are obtained by using a code from Jazwares toys, redeemed from a code given in an ultra-rare toy box. The Magenta Seal was released promotionally as an AJ Box item. For a short period following their original release, 'Small' promo pets from the Jazwares toys could be made repetitively, hence lowering their value. 'Big' Jazwares toy promo pets never had this opportunity.
Big Pets include: Pet Hedgehog, Pet Seal, Pet Groundhog, Pet Sloth, Pet Otter, Pet Dove, Pet Golden Pony, Pet Golden Armadillo, and Rare Non-Member Pet Fennec Fox.