How do i get pet odor out of carpet properly?

Enzyme cleaner is the only thing that actually breaks down urine. Ordinary carpet shampoo covers it for a day and then it's back, especially when the weather is damp. Soak it properly, enough to reach the underlay, because that's where the smell is living, then let it dry on its own. Stay away from anything ammonia based - to the dog it smells like a toilet and they'll go back to the same spot. A cheap UV torch in a dark room will show you the old patches you didn't know were there.