Rat Behavior & Introductions

One of the greatest joys of owning rats is getting to know their unique personalities. After more than 20 years of breeding and sharing my home with these incredible little companions, I've learned that every rat is different. Some are outgoing from day one, while others need a little extra time and patience.

Understanding normal rat behavior can make bringing home a new friend much less stressful for both you and your rats.

Introducing a New Rat

Rats are highly social animals and should always have at least one companion. Most introductions go smoothly, but older rats—especially those between 6 and 14 months of age—may be a little more cautious about accepting a newcomer. Dominant (alpha) rats often take longer to warm up, so don't be discouraged if introductions require a little patience.

Step 1: Quarantine

Always quarantine your new rat before introducing them to your existing rats.

• Quarantine for 2–3 weeks whenever possible.

• House the new rat in a separate cage.

• If possible, keep the quarantine cage in a different room.

• Wash your hands between handling your new and established rats.

This helps protect your current rats from illnesses that may not show symptoms right away.

Step 2: Scent Swapping

Before allowing face-to-face introductions, begin exchanging scents.

Swap hammocks, blankets, toys, or a small amount of bedding between the cages every day or two. This allows both rats to become familiar with each other's scent before they ever meet.

Step 3: Meet on Neutral Ground

Choose a space that neither rat considers their territory. A dry bathtub, playpen, or other enclosed area works well.

Place a towel on the bottom along with a couple of clean hides or toys.

Allow the rats to explore each other naturally. Some sniffing, squeaking, chasing, pinning, and even a little boxing are completely normal while they establish their social hierarchy.

If they remain calm, let them spend 20–30 minutes together. Offering a few treats can help create positive associations.

If the rats form a tight, silent "rat ball," draw blood, or one relentlessly attacks the other, separate them immediately. Give everyone a day or two to settle down before trying again.

Step 4: Moving Into Their Shared Cage

Once you're confident the rats are getting along, thoroughly clean the cage they will share.

Wash shelves, hammocks, hides, toys, and litter pans to remove as much scent as possible. Rearranging the layout also helps prevent one rat from feeling like they're defending "their" space.

Continue supervising closely during the first day or two.

Normal Behaviors During Introductions

Not every disagreement is a fight. These behaviors are usually normal while rats establish their social order.

Sniffing

Rats gather information with their noses. A dominant rat may sniff more insistently and even use their paws to hold another rat still while investigating.

Squeaking

Squeaking is simply communication. It often means, "Hey, I don't like that," and is very common during introductions, grooming, and play.

Hissing

Some rats may hiss or forcefully exhale when they feel uncomfortable or want another rat to back away. It's often a warning rather than an invitation to fight.

Side (Rump) Pushing

One rat may bump another with their side or rear to test boundaries or establish dominance.

Boxing

Rats sometimes stand on their hind legs and push at each other with their front paws. While it can look dramatic, it's usually a normal dominance behavior.

Pinning

One rat may briefly flip another onto their back and hold them there. This is a common way rats establish their hierarchy and is generally not a cause for concern if no injuries occur.

Everyday Rat Behaviors

Bruxing

Bruxing is the gentle grinding of a rat's teeth. It usually means your rat is relaxed, happy, or content.

Boggling

When a rat bruxes intensely, the muscles in their jaw cause the eyes to gently move in and out of the sockets. It looks unusual, but it's completely normal and is often a sign of a very happy rat.

Heat Cycles

Female rats come into heat approximately every 4–5 days.

During this time you may notice:

• Ear wiggling

• Small hopping movements

• Briefly arching the back when touched near the hips

• Increased activity or excitement

These behaviors typically last only a few hours.

Building Trust

Every rat bonds at their own pace.

Some babies are confident from the moment they arrive home, while others need time to build trust. Spend time with your rats every day, offer treats from your hand, speak softly, and let them come to you at their own speed.

The strongest bonds aren't built overnight—they're built through patience, consistency, and positive experiences.

Before long, you'll likely find your rats waiting at the cage door to greet you, climb onto your shoulder, or curl up in your lap. Watching that trust grow is one of the most rewarding parts of sharing your life with these wonderful little companions.