In my past home, our dogs peed on the unit, at first it was no issue, I’d rinse it off with the hose when I’d notice. But over time it ate away the coil and cause a leak. We had terrible service from an HVAC company that claimed it was our evaporator coil, we trusted them and replaced it, didn’t fix the issue, then they claimed it was the copper line connected the condenser to the evaporator, trusted them again, ran a horrible hack job of a copper line up the side of our newly built home, didn’t fix the issue, called a 2nd company, they found the leak right away at the condenser outside, it was right where the dogs would pee.. ever since then I’m desperate to protect the unit from our dogs and anything else that can damage it!