Rodent

Rodents are a group of small pets. They were first introduced in The Sims: Livin' Large and reappeared in The Sims 2: Pets, The Sims 3: Pets and The Sims 4: My First Pet Stuff.

The Sims: Livin' Large
In Livin' Large, the guinea pig was introduced. If the cage wasn't cleaned for a long time, and it bit a Sim, the Sim would become sick. The fastest and easiest way of curing this sickness is to buy the guinea pig painting and look at it.

The Sims 2: Pets
The Sims 2: Pets adds womrats. They can be purchased by buying the FMCU 3000 in buy mode, and then using the cage's "Restock" option, which can only be done if the cage is empty and clean. Womrats cost §75.

Variety of womrats to choose from:
 * Black
 * Whitebrown
 * Rex
 * Panda
 * Albino

The Sims 2: Apartment Pets
In The Sims 2: Apartment Pets, hamsters and guinea pigs are some of the pets Sims need to take care of.

The Sims 3: Pets
Rodents are one of the various kinds of minor pets introduced in The Sims 3: Pets. They can be caught outdoors like other collectibles. Rodents can be kept temporarily in the inventory, but they might eventually run away if kept for too long. Rodents need to be placed in terrarium and be fed regularly.

Being a collectible pet, there is no limit to the amount of rodents a Sim can collect.

List of rodents
Although they are referred to as rodents in-game, shrews and hedgehogs are not actually rodents.

The Sims 3: Pets introduces 7 Rodent types. Each has its own rarity and worth.

There are only 3 common rodent available via the "Stock a Terrarium" option. THe rest must be caught in the wild.

The Sims 4: My First Pet Stuff
The Sims 4: My First Pet Stuff adds four new rodents in special cages. Unlike cats and dogs, rodents do not have life stages. However, they can still die of old age or starvation. When a rodent has passed away, a notification will appear, and the rodent's "soul" can be seen leaving the cage.

Sims can buy the Feat Anti-Aging Treat (§300) to halt their aging. The treat can be purchased on the computer or vet clinic.

Cage
There is maximum one rodent per cage. As long everything is available in their cages, rodents would be able to stay healthy. When a rodent cage is purchased, the new rodent will be well fed. Sims need to refill the food bowls and clean the cage regularly.

The following interactions are available on rodent enclosures:
 * Clean Habitat
 * Fill Food
 * Feed Treat
 * Observe
 * Play With
 * Purchase Rodent
 * Release
 * Rename
 * Study Rodent (Child/Teens Only)
 * Talk
 * Investigate and React (Cats and Dogs) (Require The Sims 4: Cats and Dogs)

The cage has a corkboard that allows Sims to pin postcards on.

Rodent travels
Rodents in The Sims 4: My First Pet Stuff can travel to far away lands. They sometimes leave their cage and travel. A note can be seen in the cage, notify they have left the cage.

Notifications will inform the adventures along the way.

Rodent Fever
If Sims neglect the rodent for a period of time, rodents may contract Rabid Rodent Fever. Sims who play with these animals can be bitten, resulting in a "Bite-Sized Bite" moodlet that lasts for two hours. A Sim is more likely to be bitten if he or she has a poor relationship with the rodent they are playing with. After two hours, the moodlet will either expire or turn into the "Fuzzy Feeling" moodlet that lasts for an additional 24 hours. Each subsequent stage of the disease lasts 24 hours: Sims will get the "Fuzzy Fever" moodlet in the next stage, where the disease becomes contagious to other Sims, and will transition to the "Rabid Rodent Fever" moodlet in the final stage of the disease. They will die of the disease after this moodlet expires. Their ghost will appear as an oversized hamster foaming at the mouth.

At all stages of the disease, Sims can cure themselves either by buying rodent remedies using a computer or asking about the fever at the local vet clinic. Ghost can drink the serum to cure foaming and transform back to human form.