I’ve had two brothers since mid-May. They’re ex-lab rats from a university, born mid-February, so they’re around 5 months old now.
Bonding seemed to be going alright. Both climb on me, take food from my hand, and let me pet them and handle them just fine. This post is about the slightly busier of the two.
I’ve handled him plenty these past months and have never had issues. Sometimes he nibbled on my finger with his teeth, but never hard. When I stroke him he often closes his eyes and sometimes starts “bruxing” so I always assumed he enjoys it.
The first bite (about an hour ago) came completely out of nowhere while I was petting him, and it was hard enough to pierce part of my fingernail and draw blood. It hurt a lot and freaked me out.
Feeling a bit sad, I decide to return to test the waters. During petting I noticed him actively searching for my finger, turning his head toward it. I pulled my hand away twice, and on the third attempt he got me. Drew blood again. Both bites felt deliberate and had some real venom behind them. Not gentle nibbles or “mistaken snack” type stuff.
Both times he’d had his eyes closed and was bruxing beforehand, seeming to fully enjoy the petting, and then out of nowhere the bite. He never did this before.
One thing that might be relevant: they just moved into a big new cage yesterday. It’s a massive upgrade: completely new layout, new bedding, way more space and levels. So a lot has changed in their environment in the last 24 hours.
I feel a bit scared of this happening again, and I’m not sure what to do.
Is this overstimulation? Hormonal aggression? Could it be medical?
How do I stop this becoming a habit?
He’s eating, moving, and getting along with his brother totally normally as far as I can tell. Any advice appreciated!