Bruxing is when they grind their teeth together and that's exactly what it sounds like. If you're curious you can go onto youtube and search rat brux and you'll probably find something. (Try searching rat boggle too, I've never seen my rats do that! :lol: )
Both sexes should both brux (it wears down their teeth), and boggle (popping the eyes in and out of the sockets) as a sign of pleasure, though the rat's personality should dictate how often/if they'll do it.
Is age a factor, or is it just personality? My older girl is about 5 months and she bruxes all the time when I'm nearby, but my baby (who is 10 weeks old today ) only started bruxing noticeably around me about a week ago, and she doesn't even do it very much.
I've seen my rats boggle before... They don't do it very often... But it's so adorable when they do.
Although the first time they did it... It scared me horribly because I had no idea what was going on, lol. Luckily I found some information about it before I had a heart attack, lol.
In my experience, bruxing with the eyes half closed and very relaxed (possible with boggling at the end) is contentment. When the bruxing is quite loud and harsh, and the rat is tense, then this is fear or pain, but each rat is different. :roll:
i've never noticed boggling from my ratties, but they brux a lot. i think mozart bruxes a lot in panic though, as she's skittish, and a large unexpected noise will send her running for cover and a moment later you'll hear her bruxing. it's pretty cute though from picasso, lol.
My new baby likes to sit on my neck where you would feel for your pulse, and brux. She bruxed for the first time last night. Baby bruxing sound was new to me, I freaked and thought she had a breathing problem for a minute lol.
All my rats have boggled, except for my new baby. Mika is a notorious boggle-er, it doesn't take much to get her going.