I think we get used to the faint odors left behind by our animals. Recently our dog club sprinkled Sweet PDZ granules in our potty yards to help neutralize odors. The product was designed for horse stalls, but seems to work pretty well in runs and exercise areas. It’s totally green and non-toxic. It’s available at feed/tack stores in 25  pound bags. Nope, I don’t have stock in the company, but their stock is pretty high with me.
We’ve had a lot of rain recently (well, it’s a lot for New Mexico), and I realized that my patio (thanks, Inca) radiates an unpleasant odor. The Sweet PDZ is making a huge difference out there.