Have a male dog?  They can be a very expensive pet to own if you don’t install a little fence around your air conditioner.  Their  urine is acidic and it can eat through the fins and coils. Male dog urine will completely corrode away the aluminum cooling fins on an air conditioner unit. I mean completely, into a disgusting powder you can wash away with your hose and have nothing left. As a home inspector we see this all the time.