my shih tzu also same... for the first 1 month.. everynite i have to sleep next to her.. and when i go work.. she will make a menace around the house.. that is quite understanable coz her teeth is itchy .. like a newborn baby.. but after she shed her new teeth.. it will be less and less..

if u wan to train her.. beating sometimes dont work.. i recommend using positive reward..

u can tell when she is about to pee and poo...
when she does that.. carry her to one spot only
after she did her business.. reward her with cookie from eukanuba.. most dogs wont be able to resist it..

until she learn where and exactly when to pee or poo...
after u catch the timing .. most of ur problem soft..

second.. leave her in cage when u wanna go out.. initially she will yip and bark like crazy.. so u have to have a solid heart...

or else u house will turn up side down.. i stay by myself its still ok..
but i assume ur housemate doesnt like the idea of ur dog pising around his/her place.. no matter how much a dog lover is also the same..

my last time experience : my shih tzu go chew around wood base furtinure leg..
and all my favourite cd... my shoes .. my socks.. practically everything..

u might wan to consider a large cage maybe meant for rotwiller.. but be careful of the cage gap where ur shih tzu step.. i had a friend the shih tzu leg got stuck and now the leg like walking akward.. so put a plastic netting on top or buy the blue plastic like what the petshop ppl use.. shih tzu is the kind of dog need attention and care... and they are quickly adapt to new teaching.. but u must also Know let the shih tzu knOw when u r playing with her or when u r serious or angry..

good luck with ur training btw.. shih tzu can learn how to open the cage by themselves.. so becareful on that... when u say u stay in balcony i assume u live in flats or condo.. malaysia law dont allow pets in that kind of spaces.. u better be careful not to let ur shih tzu bark or yip too much.. one call to spca and bye bye to ur shih tzu. last reminder.. had a friend who siberian husky fell from 8th floor via the balcony grill gap.. so u know whats best for ur lovely dog..

u all should c the meat chunk in a bottle from pedigree..
every weekend i go giant do grocery shoping.. i sure buy one tin back..
she can actually finish the whole tin in one go..
and still lick the bowl dam clean.. until i cant find the oil stain..
no need to clean and worry bout the ants...
ppl normally feed their shih tzu around 10-20 pcs of dog food..
i buy eukanuba small breed 3kg pack..
and i give her a chunk of it.. around triple the amount most ppl give..
twice a day.. haha and she is the fattest shih tzu i have ever seen..
hahaha.. also shIt a lot...