Collect all the animals, which can cause your rat harm, in one place and keep them in sight. Of course, if your, say, a dog befriends a rat, it can track a fugitive by the smell. Doors leading to outside, also need to close.
Beeps to call the escaped rat to himself. Accustomed to his nickname or sound toys-tweeters, the roof can immediately have recourse to you, especially if she is walking quite a while and got hungry. Otherwise, you can long wait for the return of his hungry pet. And if the animal is frightened, it will hide.
Look into every corner and into every crevice, and listen for the slightest rustle. Rats usually hide in places like under the bed, behind the wardrobe or in a cupboard, behind the fridge or elsewhere in the kitchen. While they can be difficult to get out.
If you find a place where hiding escaped rat, try to use food lures to to get her out. Be prepared for the fact that the rat can dramatically pull out a piece of favorite food right out of your hands and then run off into "the hole". These animals are extremely agile.
If your ploy with toy Squeaker and treats don't work, try to sit quietly next to the refuge of the runaways. Maybe she will come to you by itself. Also try to put a cage with food and water near the spot where the rat is hiding. Hungry, she can run into the cage to eat. If ran a few rats, one caught and appetizing chromiuma rat can attract the attention of all the other escaped animals.
If your home rodents are well behaved when they are bored to explore the apartment or house, they will come running to you. If all attempts to catch escaped animals, fails, buy a special trap for small animals.