📘 Rat Terminology Glossary (Bookmark This Page!)

Common Rat Terms Every Owner Should Know

If you're new to owning pet rats or you've been around them, you've likely heard some phrases that aren't used with other pets because the rat community has its own vocabulary and learning it makes everything from behavior to health to bonding much easier to understand.

This glossary is designed to be a reference you can come back to anytime!

Bookmark it! You’ll use it more than you think! 💛

🐭 General Rat & Community Terms

Buck: Male rat.

Doe: Female rat.

Dominant: The rat who holds higher social rank.

Fancy Rat: Rats bred specifically as pets with attention to temperament and traits.

Feeder Rat: Rats bred to be sold as reptile food.

Mischief: A group of rats.

Pocket Puppies: A common affectionate nickname for pet rats due to their intelligence and social nature.

Pet Rat: Any domesticated rat kept as a companion.

Pup: Baby rat.

Litter (babies): The offspring born to one mother.

Litter (bedding): The substrate used in litter trays.

Rat Parent/Rat Mom/Rat Dad: Common terms used by owners to describe themselves.

🧠 Behavior & Communication Terms

Allogroom: One rat grooms another, often around the head and neck.

Barbering: Excessive grooming that can result in fur being nibbled off.

Belly-Up Roll (Pin): A defensive or submissive behavior where a rat rolls onto their back.

Bite: Teeth break the skin. Different from a nip.

Boggling: Eyes vibrate in and out during intense bruxing, usually when extremely happy or emotionally stimulated.

Bound (Ricocheting Jump): Springy hopping movement, often seen when a rat is excited.

Boxing: Two rats stand on their hind legs and bat at each other with their paws. Often playful, but can sometimes indicate tension.

Bruxing: Grinding teeth. Can indicate relaxation and happiness, but may also occur when nervous depending on context.

Chatter: Repetitive grinding of the incisors against each other.

Dorsal Immobility: Freezing or “going limp” behavior that can occur when a rat is scruffed.

Fight or Wrestle: Escalated conflict involving rolling, biting, and loud vocalizations.

Flank Marking: Rubbing scent glands against objects to mark territory.

Forequarter Pivot: Defensive posture where a rat pivots while upright to face a perceived threat.

Gallop: A movement pattern where both sides of the body move nearly in sync.

Head Bob (Sway): Head movement used to improve depth perception in rats with poor eyesight. Normal behavior in red eyed rats.

Hiss: A vocalization used during conflict or high tension.

Marking: Depositing tiny drops of urine while walking to scent an area.

Mounting: Can be sexual, dominance-related, or playful and is seen in both sexes.

Nibble: Gentle teeth contact, usually exploratory or affectionate.

Nip: Light pinch with teeth where the skin is not broken.

Nose-off: Two rats freeze nose-to-nose during a social standoff.

Open-Mouth Tooth Display: Threat display where the rat opens its mouth to show incisors.

Overmark: Marking over another rat’s scent.

Power Grooming: One rat forcefully grooms another to assert dominance.

Shriek: Loud scream indicating pain, fear, or intense protest.

Sidle: Sideways threatening walk with arched back, often called a “crab walk.”

Social Biting: Biting that occurs during social conflict between rats.

Stash: When a rat hides food somewhere for later.

Tail Wagging: Some rats gently wag their tail when excited or content.

Tonic Immobility: Freezing response that can occur when pressure is applied to the upper back or nape.

Trot: A movement pattern where the legs move in alternating rhythm.

🏃 Movement & Physical Actions

Bound: Springy jumping motion.

Gallop: Movement where legs move in sync.

Trot: Alternating leg movement.

Popcorning: Jumping and running around in excitement like popcorn popping out of a bucket.

🧬 Genetics, Appearance & Physical Traits

BEW: Black eyed white (white rat with black eyes, very rare)

Bristle Coat Rex: A rex coat variation where the curls are extremely tight, often resulting in a rough, scratchy texture and sometimes patchy fur.

Buck Grease: Yellow or orange staining on the skin of mature males caused by hormonal oils.

Dumbo: Ear type where ears sit lower on the sides of the head.

Hat Ears: Informal term for ears that sit between standard and dumbo placement, giving the appearance of slightly drooped ears.

Odd-Eyed: Two eyes of different colors.

PED: Pink Eye Dilution gene responsible for certain lighter colorations.

RED: Red Eye Dilution gene that creates colors like beige and fawn.

Rex: Curly or wavy fur and whiskers.

Sphynx: Hairless rats.

Standard Ears: The most common ear type where the ears sit atop the head.

🩺 Health & Medical Terms

Head Tilt: Head held at an angle, often caused by inner ear or respiratory infection.

Hind Leg Degeneration (HLD): Medical condition where the nerves and muscles in the back legs weaken which is common in older males.

Myco aka Mycoplasma pulmonis: A bacteria most domestic rats carry.

Pica: Eating non-food substances, often due to nausea.

Porphyrin: Red discharge around eyes or nose caused by stress or illness.

SDA: Viral illness affecting respiratory system and glands.

Sendai: Contagious virus similar to distemper in rodents.

👶 Breeding & Baby-Related Terms

Altricial: Born helpless, blind, and hairless.

Behavioral Estrus: Phase where a female displays mating behavior.

Communal Nesting: Females raising babies together in one nest.

Communal Nursing: Females nursing each other’s babies.

Heat: The period when a female can become pregnant.

Lordosis: Female mating posture.

Nest-Build: Gathering and arranging materials to create a sleeping or birthing area.

Nursing Posture: Mother crouched over babies to allow nursing.

Pinkies: Newborn baby rats before fur grows in.

Postpartum Estrus: Heat cycle that happens immediately after giving birth.

Pup: Baby rat.

Pup Retrieval: Mother carrying babies back to the nest.

Solicitation: Female initiating mating behavior.

Stud: A male used for breeding.

Wondering about colors, markings, coat types and ear types? We’ll get into that in another post.