Untamed dog - duty wise

My dog (female) is 1.5 years old. We haven't been successful in taming
her. I've tried everything I heard of, but still whenever we're not
around she allows herself to poop & pee in our house.

Paula...

Crate her when you are not at home and tether her to you when you are
home so that you are always around and will notice when she is
sniffing out a place or squatting. Then scoop her up and take her out
to do her thing. Have a huge party when she does it outside. They
have to learn not to go inside as well as to go outside, which is why
you need to keep a close eye on her inside to make sure you can give
her the message that inside is not okay by interrupting and taking her
out instead.

We tried to shout on her, but it haven't proven useful since usually
she poops & pees when we're not around so shouting a couple of hours
after the deed isn't very effective.

We tried to give her prizes whenever she poops outside, but still, to
no avail.

shelly...

First, stop shouting at her. It is counterproductive.

Second, contain her when you are not home. A crate is usually an
excellent tool for this. Make sure it is *just* large enough for
her to stand up, turn around, and lie down. If it is too large, she
may poop/pee in one corner of it. If it is too small, she won't be
able to rest comfortably in it.

Third, when you are home, supervise the dog so that she cannot sneak
off and have accidents. Every accident you allow her to have will
undermine her housebreaking.

Fourth, you have to go outside with her--at frequent, regular
intervals, to start with. When she relieves herself, immediately
praise her, give her a cookie, or do whatever it takes to let her
know that you are overjoyed with what she's just done.

It may take some time, because you've inadvertently trained her to
think that going indoors is okay. But, if you are consistent and
patient about following those steps, she *will* become house trained.

Any idea ? Are we too late ?