Pet urine isn't a smell problem. It's a contamination problem that lives in three layers: the carpet fiber, the backing and glue, and — in serious cases — the pad and the subfloor underneath.
Most DIY products only treat layer one. That's why the smell comes back two weeks later, especially in warm humid weather.
The Spiker pet odor protocol starts with UV inspection to map every deposit, even the ones you can't see. Then we apply an enzymatic treatment matched to the severity. For surface-level contamination, that's enough. For deeper contamination, we sub-surface flush at the pad layer. For severe contamination, we replace the pad — the only honest answer when the contamination is structural.
The thing nobody else will tell you: enzymatic sprays from the hardware store can actually make the problem worse if they're under-dosed, because they neutralize part of the bacteria but leave a residue that becomes a re-contamination zone.