I have a puppy who I am trying to potty train right now and she sometimes has accidents. I know that dogs like to go where they can smell they have peed or pooed before, so I want to get a cleaner that will completely eliminate the smell from the carpet. The cleaner I have now eliminates the odor for me, but apparently she can still smell it, since dogs have a keen sense of smell. I have read about enzymatic cleaners that can eliminate the smell but I am unsure about what brand to buy. At the pet store there are so many brands and I’m not sure what exactly to look for.

I have also heard about using vinegar to get rid of the smell, but I don’t want my carpet smelling like vinegar anymore than I want it to smell like pee or poop.

Here’s my problem…
I took in a foster dog for about a month (into my condo).
I left the dog alone a few times for no more than 4 hours and the dog never pissed in the house in front of me. There were no visible signs of the dog peeing on the carpet, no stains or anything (note: I have very thick carpet).

However about 1 month after I gave the second dog back, I noticed the whole room was starting to smell slightly like piss…but had no clue from where.
So I sniffed with my own nose and found about 6 spread out locations (it’s like the dog walked as he pissed while I was gone).

Now I’ve tried everything: baking soda, carpet shampoo, laundry detergent, enzymatic cleaners like Nature’s Miracle…and let the whole place air out afterward…no luck.
In fact the smell kept on getting worse and the only cleaner that seemed to help at all was Nature’s Miracle (enzyme-based cleaner) and it only seemed to really help for about a day.
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I recently (IE today) dumped a few gallons of ammonia on the bad spots of my carpet. I guess my question is how soaked do I have to get my carpet (and with how much per gallon of what cleaner?) to get rid of this terrible smell that only seems to get worse over time.