After tasting the cats and dogs urine, the cats was quite bitter, one of the dog's was sour, the other was sweet (but he has diabetes).
I'll have time this afternoon to take a look at the above mentioned possibilities. No further leakage since though.
Ours did this the second night home after purchasing it (2002 with 128k miles; we are the fourth owners). The power steering reservoir is empty, so it' a pretty easy call without licking the garage floor. The hoses were replaced by the previous owner (at the dealer), but that's 90 minutes from home, so husband will get his hands dirty tomorrow after work.
So, I'm curious...what did you discover? Did you check all the fluids? What was it?
I believe there is a drain from the windshield area that discharges behind the front driver's side wheel.