But when Krypto has to go, does his pee melt through objects? Or is it just like ordinary pee?

The Kents' toilet bowl seems to be fine. If Superman's pee is not corrosive, I bet Krypto's pee isn't either. I can even bet they are much cleaner than normal wee cause their body has super antibodies and can clean whatever passes through their systems.

Maybe the gas of Krypto is super explosive.

@ssejllenrad: Maybe their urethra muscles are as strong as the rest of them. Urine leaving the primary shaft at mach 5....thats a truly terrifying thought.

Maybe the gas of Krypto is more powerful than Marvel's Storm.

I was expecting a doggy style joke.