I've recently got some new kittens, theyre about 12 weeks old and lovely! problem is theyve come from a home with two dogs and loads of other animals. one of them hides under the sofa all the time and only comes out to eat, the other one does pretty much the same but meows all the time. they let me handle them but as soon as i stop they go back into hiding. anyone got an ideas as to how i can reassure them and make them not scared anymore? thanks!