Babblington - 7 out of my 9 are rescues.
2 vicious and bitey. one more so than the other.
Pearl - the girl we got first was the pit bull of rats. She was terrible, but like yours, ok when out.
every day i sat next to the cage for a bit. then i would put my hand in....make your hand into a fist and offer knuckles - it hurts less! and squeak squeak squeak if it bites....(i used to "eeeep" - believe it or not - it works)
i also offered yoghurt on a spoon.....if she bit that she knew about it.
i had her out as often as possible and just carried her about on my shoulder. i did this daily. for hours.
i also let her "free range" in the bathroom, and i would sit on the floor, and let her come to me.
she is perfect now. a proper laydeeeee.....but the other thing i think that really helped her was getting her some company. they are social animals - they live in groups naturally. getting a couple of confident youngsters helped her.
my rescue boy wouldnt let anyone in the shop touch him. not one person could get near him.
i used a glove to begin with, but it seemed like he just didnt know what was edible and what wasnt - it was odd - he seemed a happy wee chappy but bit. he really injured a woman in the petshop.
but the oddest thing happened - when i got him home....that very night i used a gloved hand to get him out of his carry box....he sat down my top all night. not a bite. I went to a breeder and got him 2 youngsters for company within a few days of him arriving.
he was a bit jumpy and a bit nervous. he bit me exactly 3 times. once when i reached over the top of him and startled him.
once when he was on my shoulders and he bit both ears. i eeped.
he never did it again. in fact now he is my cuddly boy. i love his smell the most.....he took to his little pals very very well (though he is definitely top rat! even though the other 2 are now bigger than him!)
when he got poorly, i took him to the vet, and even the vet commented on his face as i stroked him.....you could see he was getting such comfort from a friendly hand stroking his little face.....
we are bonded now. totally and utterly. i adore him.
and his smell.!!